what are the causes of poor sperm quality?
['Drug use. Anabolic steroids taken to stimulate muscle strength and growth can cause the testicles to shrink and sperm production to decrease. ... ', 'Alcohol use. ... ', 'Occupation. ... ', 'Tobacco smoking. ... ', 'Emotional stress. ... ', 'Depression. ... ', 'Weight. ... ', 'Sperm testing issues.']