Does hypogonadism go away by itself when it occurs or does it require medical treatment?

It would require evaluation to ascertain the cause and treatment depending on the cause. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.

Depends of the cause of hypogonadism.If it is due to permanent damage to the gonads(testicles or ovaries)will require replacement (hormonal)treatment.