It’s important for men to understand that testosterone naturally starts to decrease after the age of 30, so they will experience changes in their bodies as a result. But testosterone levels can drop to an unhealthy level and need to be investigated and treated with the help of a doctor. Low testosterone levels can be the result of a number of medical conditions such as an infection, injury to the testicles, hormonal disorders, obesity, diabetes, liver or kidney disease, and other medical conditions. Low testosterone can cause the sufferer to feel tired, gain weight, lose strength, lose interest in sex, lose motivation, and other symptoms that patients often chalk up to getting older. While lowered testosterone production is part of getting older, there is a point where testosterone can drop too low and can have negative effects on bone density, make the bones more fragile and prone to breaking. Low testosterone is treatable though and your doctor can help you understand what your options are for treatment based on your testosterone level.