Men with blood clots in urine without pain may be caused by acute glomerulonephritis, prostatic hyperplasia, vitamin K deficiency and other diseases. 1. Acute glomerulonephritis: this disease is mainly caused by beta hemolytic streptococcal infection, which can occur after upper respiratory tract infection, skin infection, scarlet fever. Most of the patients will have symptoms such as hematuria and decreased urine volume, because of the low urine volume, they can’t expel the blood in the urine out of the body in time, so there will be blood clots in the urine without pain. 2. Prostatic hyperplasia: the occurrence of this disease may be related to the abnormal ratio of sex hormones, imbalance between cell proliferation and apoptosis, inflammation, prostate mesenchymal gland epithelial interactions and other reasons, the common symptoms of blood in the urine, increased nocturia, etc., and some patients will have blood clots in the urine without pain. 3. Vitamin K deficiency: the causes of this disease include insufficient intake of vitamin K, oral vitamin K antagonists, liver disease and so on. Its main manifestation is bleeding, such as nosebleeds, hematuria, vomiting blood, bleeding gums, etc. Therefore, some patients may experience men with blood clots in urine without pain. The causes of male urine with blood clots without pain are more reasons, it is recommended to go to the hospital in a timely manner to check, clarify the cause of the disease and follow the doctor’s instructions to deal with the treatment.