Have you ever experienced a momentary loss in strength when you laugh? Many people also express their lack of motor control for a few moments after laughing or experiencing extreme emotions. Scientists now have some answers as to why this happens. It turns out that laughter can trigger a reflex in your body that weakens your muscles, almost to the point of collapse. This isn't just a feeling; it's something that can be measured using electrical signals to see how your muscles react.

Laughter Can Make You Weak!

Researchers in the Netherlands, whose findings were published in the medical journal The Lancet, 1999 made this discovery while studying a condition called cataplexy. Cataplexy causes people to suddenly lose muscle control and collapse during strong emotions, especially laughter. They were comparing people with cataplexy to a control group without the condition. While studying the muscle reactions of the control group during different emotions, they unexpectedly found that laughter caused a significant weakening of muscles.

Testing the Laughter Effect

The researchers used electrodes to measure the H-reflex, which is a way to see how muscles contract. They showed the control group, which included fellow researchers and medical students, various slides to evoke different emotions. Instead of being nervous, the participants were relaxed and joking around. That's when they noticed something interesting, when the participants laughed, their H-reflex almost disappeared.

To confirm their findings, they conducted another experiment, this time intentionally trying to make people laugh. Sebastiaan Overeem, a medical student known for his humor, was tasked with getting the new group of subjects to laugh. He used jokes, including ones about Belgians, which were particularly effective. Every time a subject laughed, their H-reflex significantly weakened, proving that laughter does indeed cause a measurable muscle weakness.

How Does Cataplexy Affect Us?

The Cleveland Clinic explains that it happens while you're awake, and it's a common sign of a sleep problem called narcolepsy. Narcolepsy makes you feel so sleepy during the day that you can't stop yourself from falling asleep, even when you don't want to. Sometimes, cataplexy can also be caused by very rare problems you get from your parents.

When you have a cataplexy attack, your muscles can get a little weak or very weak. Sometimes, only a few muscles get weak, like the ones in your face, making your jaw drop or your head nod. However, sometimes, all your muscles get weak, and you might fall down. The important thing is, you stay awake and know what's happening during the attack. This is different from fainting or having a seizure, where you lose consciousness.

Cataplexy attacks usually only last for a few seconds or minutes, and then your muscles go back to normal on their own. How often they happen is different for everyone. Some people have many attacks every day, while others only have a few attacks each year.

When COVID-19 first emerged, it was largely seen as a respiratory illness. Over time, doctors discovered that the virus can affect nearly every major organ, including the heart, kidneys, liver, and skin. While cough, fever, and fatigue remain common signs, some people also develop unusual skin reactions. So, can COVID-19 actually lead to rashes? Here’s what experts have found.

Can COVID-19 Really Cause Rashes?

When COVID-19 first emerged, it was largely seen as a respiratory illness. Over time, doctors discovered that the virus can affect nearly every major organ, including the heart, kidneys, liver, and skin. While cough, fever, and fatigue remain common signs, some people also develop unusual skin reactions. So, can COVID-19 actually lead to rashes? Here’s what experts have found.

What Do COVID-19 Rashes Look Like?

Skin changes linked to COVID-19 are not among the most common symptoms, but they do occur. These rashes may appear on the neck, mouth, or toes and are often caused by inflammation in the body, as per Health website. They can look like flat or raised patches, small round spots, or itchy bumps. In some people, these rashes appear while they’re infected; in others, they show up weeks later.

Why Do These Rashes Occur?

Researchers believe COVID-related rashes are connected to how the virus interacts with the body’s ACE2 receptors, which are found in the skin. When the virus attaches to these receptors, it can trigger the release of inflammatory proteins called cytokines. This inflammation may lead to skin irritation, itchiness, or lesions.

Common Types of COVID-19 Rashes

1. COVID Toes

One of the most recognized skin signs of the virus, “COVID toes,” resembles chilblains, which are cold-weather sores. They appear as pink, red, or purple patches, sometimes with swelling or blistering. This condition is seen more often in younger people and may occur even after other symptoms fade.

2. Hives (Urticaria)

Hives tend to appear suddenly and can spread across any part of the body. They’re itchy, raised, and may come and go within hours or days.

3. Neck Eczema

Some people develop eczema-like rashes on the neck, chest, or trunk during or after COVID-19. The patches can be itchy and vary in color depending on skin tone—pink on lighter skin and brown, gray, or purple on darker skin.

4. Oral Rash

COVID can also cause soreness or peeling inside the mouth or on the lips. The area may feel dry, irritated, or scaly as it heals.

5. Vesicular and Papular Rash

These small, itchy bumps can be filled with fluid (vesicular) or solid (papular). They may appear anywhere on the body and are often linked with ongoing inflammation.

6. Pityriasis Rosea

This condition begins with a single large patch on the chest, back, or abdomen, followed by smaller spots that form a tree-like pattern. Though harmless, it can take several weeks or months to fade.

7. Purpuric or Vasculitic Rash

These rashes appear as dark, bruise-like spots caused by small blood vessel damage under the skin. The color may range from red and purple to brown or black, depending on skin tone.

How Long Do COVID Rashes Last?

The duration depends on the type of rash and the person’s immune response. Most clear up within 2 to 12 days, but some, especially in long COVID cases, may persist for weeks.

How Are COVID Rashes Treated?

Many rashes resolve without any special treatment. To relieve itching or pain, applying mild hydrocortisone cream can help. For more severe or persistent cases, doctors may recommend:

• Antihistamines to reduce itching
• Corticosteroids to lower inflammation
• Blood thinners if the rash is linked to blood vessel irritation

Your doctor will determine the safest treatment depending on the type of rash and overall health.

Disclaimer: This article is for general informational purposes only and should not be considered medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any medication, or if you experience any unusual symptoms or side effects.

It is a common theme for people to feel down and sad in winter. However, why do shorter, colder days often bring on feelings of loneliness and gloom? There is a biological reason behind it. As the days get shorter, many people feel a dip in energy or mood, but for millions, this signals Seasonal Affective Disorder (SAD), which is a serious form of depression that shouldn't be ignored. Experts from West Virginia University (WVU) caution that SAD symptoms are very similar to major depressive disorder and must be taken seriously.

What Causes SAD?

SAD is much more than just feeling down when it gets dark. It's a genuine type of depression most often seen during the winter months, especially in places far north where daylight is scarce. The basic problem is simple: less natural light hits your eyes. This drop in sunlight confuses your brain's chemistry.

It messes with two vital brain chemicals: serotonin, which helps stabilize your mood, and melatonin, which controls when you sleep and wake up. This lack of light also throws off your body's internal clock, called the circadian rhythm. When all these elements get disrupted, it triggers feelings of low energy and depression.

What Are The Symptoms Of SAD?

SAD involves a cluster of symptoms that persist and significantly interfere with your daily life. The pattern is usually predictable: symptoms begin in the fall, peak in the winter, and disappear by spring. Symptoms often include:

• Feelings of hopelessness.
• Loss of interest in activities you once enjoyed.
• Significant changes in sleep (often sleeping more, or having disrupted sleep).
• Changes in appetite or increased food cravings.
• Difficulty concentrating and persistent fatigue.

The risk of SAD is higher among younger people, women, and those with a family history of mood disorders.

Can You Treat/Prevent Seasonal Affective Disorder?

Because Seasonal Affective Disorder is highly predictable, experts advise starting preventative treatments early in the fall. Seeing a healthcare provider is essential to determine the best plan and timing for treatment, rather than waiting for severe symptoms to appear later in winter.

Light Therapy

This involves sitting daily before a special light box emitting 10,000 lux of bright white light. Doing this for 30 to 60 minutes each morning is the most common and effective treatment for SAD, as it helps correct the imbalance caused by reduced sunlight exposure.

Cognitive-Behavioral Therapy (CBT)

This form of talk therapy teaches you practical skills to manage negative thinking patterns and behaviors linked to depression. CBT helps individuals reframe their outlook on winter and build effective coping mechanisms to reduce the impact of SAD symptoms.

Medication

In certain situations, a healthcare provider may prescribe antidepressant medication to help regulate mood-affecting brain chemicals like serotonin. This is often considered alongside light therapy or counseling, especially if symptoms of depression are severe or persistent.

Lifestyle Changes

Simple daily habits are powerful tools. Regular exercise boosts mood and energy, while maintaining a consistent sleep schedule keeps your body's internal clock stable. These practical steps offer significant support alongside clinical treatments.

Delhi’s air quality has taken a severe turn for the worse. As of Monday morning, November 3, 2025, the air across the capital officially slipped into the "Very Poor" category. Government data shows that the Air Quality Index (AQI) hit 316 by 9 am, meaning the air is now considered a significant health risk. In fact, one private monitor estimates that breathing the air in Delhi is currently as harmful as smoking 7.8 cigarettes a day.

Researchers and healthcare professionals have explained how pollution not only affects our breathing and lung function, but it affects multiple organs. A 2024 study published in the Scientific Reports journal showed that PM2.5 pollution particles are linked with reduction in life expectancy by 3.7 years.

However, when it comes to organ functions, pollution affects different organs differently. Here’s how.

Why Does Pollution Affect Our Organ Health?

According to the World Health Organization (WHO), air pollution is when the air contains one or more harmful substances like dust, smoke, fumes, or gas for a long time as they hurt our health.

The main way these pollutants affect us is by being breathed in. When you inhale them, they cause damage throughout your body, leading to:

• Inflammation (swelling)
• Stress on your cells
• A weaker immune system
• Changes to your cells that can cause disease (mutagenicity)

What Organs Are Affected By Pollution?

Here is a list of organs that you may not know were affected by pollution.

Brain and Mind

According to UC Davis Environmental Health Sciences Center, these pollutants are small they can travel from your lungs directly into your brain. This toxic exposure is concerning for long-term brain health. It's been linked to a higher risk of developing severe conditions like dementia and Alzheimer’s disease. It may also impact children, potentially affecting intelligence, and increasing the risk of disorders like autism. Research also shows a higher risk of stroke, depression, and anxiety disorders.

Air pollution doesn't just cause disease; it can also cause more immediate, subtle effects on healthy people, which is often called "brain fog" decreased productivity or trouble thinking clearly. Studies across various jobs, from farm workers to office workers—show that short bursts of high outdoor pollution lead to decreased work output.

Heart and Lungs

According to the WHO, the lungs are hit first, leading to immediate problems like asthma and long-term illnesses like lung cancer or emphysema. Once in the bloodstream, the particles tighten your blood vessels (arteries), which forces the heart to work much harder. This sharply increases your risk for life-threatening events like strokes and heart disease.

Skin

The Airly organization explains that your skin is naturally covered in a layer of helpful bacteria, fungi, and viruses—called the microbiome. Air pollutants (like smog) disrupt the size and variety of this helpful microbiome. When this balance is broken, harmful bacteria can grow out of control.

Being the body’s largest organ and completely exposed, shows damage from air pollution through signs like faster aging, more wrinkles, and rashes. Surprisingly, the internal effects go deeper: prolonged exposure to harmful chemicals found in pollution, such as PAHs and ozone, you face an increased risk of developing skin cancer.

Bone

According to a 2024 study published in the Current Osteoporosis Reports, growing evidence shows a link between air pollution and a higher risk of osteoporosis, a disease that makes bones weak. This is a major concern for our aging population, as severe bone fractures greatly increase death risk. While we don't know the exact pollutants or how they cause this, initial research suggests inflammation from dirty air may damage the bones. Identifying this pathway could lead to new treatments.

Kidney

According to the National Kidney Foundation, pollution adds a major toxic burden to your body's internal cleaning crew. A study of 2.5 million U.S. veterans found that breathing polluted air significantly increases the risk of developing kidney disease. The scientists estimated that over the course of the study, air pollution may have caused roughly 45,000 new cases of chronic kidney disease (CKD) and forced over 2,400 patients to start dialysis.

While the exact way air pollution damages the kidneys is still unknown, one main idea is that the tiny pollution particles you inhale travel from your lungs into your bloodstream. The kidneys then try to filter this contaminated blood, and in the process, the tiny particles directly damage the kidney cells.

Reproductive System

According to the Journal of Obstetrics and Gynecology of India pregnant people, pollution exposure increases the likelihood of miscarriages and can harm the developing baby, leading to health issues in unborn and newborn children. It threatens the future health of the population.

When a pregnant woman is exposed to pollutants, it causes an inflammatory reaction that can harm the pregnancy. This toxic exposure is linked to serious problems, including preterm labor, fetal growth restriction, death of the baby before or during birth.

Studies confirm that inhaling tiny pollution particles (PM) and nanoparticles (NP) causes excessive cell damage, leading to mutations in DNA and damage to fats and proteins in the body.

Digestive Health

According to the Northwell Health Organization, new research suggests that the tiny particles found in it contribute to digestive illnesses.

Exposure to pollution also stresses your body. This chronic, pollution-induced stress leads to an overload of inflammation and cell damage (oxidative stress) in the digestive system. This can contribute to common conditions like Irritable Bowel Syndrome (IBS), Inflammatory Bowel Disease (IBD), Gastroesophageal Reflux Disease (GERD).

Breathing in things like fine particles, fumes, and gases can cause inflammation in the digestive tract. Long-term exposure to dirty air is linked to higher risks of GERD and IBD.