These side effects typically don’t happen suddenly, and if they do, lower testosterone levels may not be the only cause. In cases where ED accompanies lower testosterone production, hormone replacement therapy may help with ED symptoms. Low testosterone levels can affect your interest in sex and lead to physical changes, sleep challenges, and emotional dysregulation. Checking testosterone levels is as easy as having a blood test. That's why medications that lower testosterone levels (for example, leuprolide) are common treatments for men with prostate cancer. Erectile dysfunction (ED) is not commonly caused by low testosterone production. Because testosterone affects so many functions, its decrease can bring about significant physical and emotional changes. For each year over age 30, the level of testosterone starts to dip slowly at a rate of around 1% per year. Testosterone levels in men can vary widely, though they generally decline in men after the age of 35 says McDevitt. To determine what’s a good testosterone level for your age, you also need to look at the clinical picture. But you don’t have to experience the negative symptoms that come with hormone declines. At its peak, during your adolescent years, a normal range for your testosterone is anywhere between 300 and 1,200 ng/dL (4). That’s when we start to check your hormone levels," McDevitt says. You may become pre-diabetic, or see your cholesterol levels rise, says Danielle McDevitt, M.D., a physician who specializes in hormones. Testosterone is a hormone that’s crucial for men’s health. It's best to measure free testosterone levels in the morning. Men and women need the proper amount of testosterone to develop and function normally. Because prostate cancer is so common, doctors tend to be leery of prescribing testosterone to men who may be at higher than average risk of having undiagnosed prostate cancer. Some men and women experience immediate side effects of testosterone treatment, such as acne, disturbed breathing while sleeping, breast swelling or tenderness, or swelling in the ankles. For example, a man with osteoporosis and low testosterone can increase bone strength and reduce his fracture risk with testosterone replacement. We process personal information and consumer health data to provide you with our products and services and maintain essential website functionality. Hone-affiliated medical practices are independently owned and operated by licensed physicians who provide services using the Hone telehealth platform. Hone is an online clinic that helps men and women manage their health. I learned the relationship between stress and hormone health goes both ways.