What are the causes of sudden painless urination in men?

Male sudden painless hematuria may be caused by drug side effects, allergic purpura nephritis, urinary system tumors and other reasons.

1, drug side effects

If the patient takes mannitol, cyclophosphamide, heparin and other drugs to treat the disease, due to drug damage to the urinary system mucosa, can cause painless hematuria.

2, allergic purpura nephritis

patients due to contact allergens lead to allergic reactions in the body, and a large number of immune complexes accumulate in the kidney, causing inflammation, damage to kidney tissue, can lead to sudden painless hematuria.

3, urinary system tumors

If the patient because of genetic factors, gene mutations and other reasons, so that the urinary system tumor formation, tumor rupture can lead to bleeding, thus causing the above symptoms.