<s>[INST] Hi, may I answer your health queries right now ?  Please type your query here... hello, i have had blood in my sperm for about 4 days now... what could it be or what should i do...  i am 25 years old, 150 pounds and have never had any problems with anything [/INST] Hi, If you had unprotected sex - need to rule out sexually transmitted infection. If not it can be due to rough masturbation, urinary tract infection, prostate infection, bleeding disorder, doing a urine complete / sperm complete can help you. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr S.R.Raveendran, Sexologist </s>