Normal testosterone values for adult men are generally in the range of 260 to 1590 ng/dl, with fluctuations in testosterone values with age. Testosterone is a sex hormone secreted by the testes and is the main major component of androgens. There are many disease factors that can cause elevated and lowered testosterone values. Some of the factors that cause elevated testosterone levels in men are testicular mesenchymal stromal cell tumors, precocious puberty, hyperadrenocorticism, and adrenocortical tumors. Factors that lead to lower testosterone values in men are hypopituitarism, orchitis, testicular dysplasia, and endocrine disorders. When the testosterone value increases or decreases, you need to go to the hospital in time for a comprehensive examination to identify the cause of the disease, and targeted treatment under the guidance of the doctor.