Testosterone is a male sex hormone that serves vital functions like maintaining bone and muscle mass, fat distribution, red blood cell production, sperm production etc. Normal testosterone level is a relative term and varies from person to person. However, a very low testosterone level is lethal and can affect sex drive, mood, and changes in muscle and fat. Many doctors say that your actual number may not be important and how you feel is what matters. Doctors typically use your testosterone numbers as a guide. There is a level that is too high and there is a level that is too low. But there is a lot of variation in the middle. It is pertinent to note that having low testosterone doesn't require treatment. "There are guys who feel completely normal and may not want any intervention, Justin Dubin, MD, a urologist and men's health specialist at Memorial Healthcare System told Men's health. He added there are more people than just numbers, so you treat someone based on their story and their labs.What Is Normal Testosterone Level?A normal testosterone level can fall into a wide range. Healthy levels are typically between 264 nanograms per deciliter (ng/dL) and 1,000 ng/dL, according to some doctors. Anything below 264 ng/dL is low, and high testosterone is above 1,000 ng/dL. Your testosterone levels fluctuate throughout the day, however, they stay within the normal range.The level of this hormone tends to decrease with age, starting in your 30s. It also fluctuates throughout the day and is usually highest in the morning. This is the reason testosterone tests are done in the morning. Two readings done on two different days are enough to get a good reading.Factors that influence your testosterone levels:The prime influence on the level of your testosterone is your age. In addition, a person's weight also plays a major role. Research has established a link between obesity and low testosterone. Leptin, a hormone found in fat cells, is thought to inhibit testosterone production. Moreover, excessive fat can also increase estrogen levels, which lowers testosterone. Other reasons include: Medication, including chemotherapyTesticle injuryThyroid functioning problemsChronic diseases or infections, like HIV, hypertension, or high cholesterolOpioid drug useSteroid useWhat Happens When You Have Low Testosterone? Low testosterone, also known as hypogonadism, can lead to a variety of physical and emotional symptoms. Physically, individuals may experience decreased muscle mass, increased body fat, fatigue, and reduced bone density, which raises the risk of osteoporosis. On an emotional level, low testosterone can contribute to mood swings, depression, irritability, and a decrease in motivation or overall well-being. It can also affect libido and sexual function, leading to erectile dysfunction or reduced sexual desire. Overall, low testosterone can significantly impact quality of life, prompting many to seek medical advice for diagnosis and potential treatment.