
Steroids are dangerous for two reasons: they are illegal, and they can damage a person’s health, especially if used in large doses over time. Also, the health problems caused by steroids may not appear until years after the steroids are taken.
Although they might help build muscle, steroids can produce very serious side effects. Using steroids for a long time can negatively affect the reproductive system. In males, steroids can lead to impotence, a reduction in the amount of sperm produced in the testicles, and even reduced testicle size.
Steroid abuse can lead to serious, even irreversible health problems. Some of the most dangerous among them include liver damage, jaundice (yellowish pigmentation of skin, tissues, and body fluids), fluid retention, high blood pressure, increases in LDL (bad cholesterol), and decreases in HDL (good cholesterol). Other reported effects include renal failure, severe acne, and trembling. In addition, there are some gender- and age-specific adverse effects:
• For men—shrinking of the testicles, reduced sperm count, infertility, baldness, development of breasts, increased risk for prostate cancer
• For women—growth of facial hair, male-pattern baldness, changes in or cessation of the menstrual cycle, enlargement of the clitoris, deepened voice
• For adolescents—stunted growth due to premature skeletal maturation and accelerated puberty changes; adolescents risk not reaching their expected height if they take AAS before the typical adolescent growth spurt
In addition, people who inject AAS run the added risk of contracting or transmitting HIV/AIDS or hepatitis, which causes serious damage to the liver.

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