If you have foamy urine and stomach discomfort, the possible clinical causes are post-normal ejaculation phenomenon, nephritis, prostatitis, and so on. 1. Normal post-ejaculation situation: some people have discomfort after sex due to prolonged abdominal activity, and there is still semen left in the urethra, so there will be foamy urine when urinating, which is a normal phenomenon. 2. nephritis: this refers to the inflammatory reaction of the renal tissue, glomerular filtration function is impaired, resulting in protein leakage, clinical manifestations of foamy urine, part of the population will also appear abdominal discomfort and general weakness. 3. Prostatitis: This condition is associated with long-term alcohol consumption, excessive masturbation, frequent urination, etc. The inflammation of the prostate gland will stimulate its secretion of prostatic fluid to relieve the inflammation, and thus foamy urine will appear, accompanied by pain in the lower abdomen, urinary frequency, urinary urgency and other symptoms. The above symptoms may also be caused by other factors, it is recommended that the patient go to a regular hospital in order to clarify the diagnosis, so as to carry out targeted treatment, and strive for early recovery.