Yes varicocele can affect Sperm quality and quantity. However, varicocelectomy doesn't always improve the Sperm parameters. It all depends on its size. There are other factors that affect sperm motility like smoking, heavy alcohol drinking, increase body weight, increase exposure to heat, steroid intake... It is well known that stopping smoking will improve motility
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.