Frequent urination, low volume, blood and small abdominal distension may be caused by cystitis, overactive bladder, urethritis and so on. 1. Cystitis: when a variety of pathogens invade the human body through different pathways, involve the bladder and grow and reproduce in it, leading to frequent urination, low volume, blood, abdominal distension, accompanied by urinary urgency, urinary pain and other symptoms. 2. Overactive bladder syndrome: patients with frequent urination, low volume, blood, abdominal distension, mainly associated with the urinary center, detrusor muscle, bladder sensory nerves and other factors, patients with urinary urgency, nocturia, urge incontinence and other symptoms. 3. Urethritis: the disease is mainly caused by pathogenic microorganisms, but also with the increase in the number of pathogens, virulence enhancement, autoimmune function decline, etc., the patient is usually manifested in the urethra itch, urethral urethral urethral redness, urethral secretion and other symptoms. It is recommended that patients go to a regular hospital in time, under the diagnosis of the doctor, according to the patient’s specific condition, to take targeted treatment, life should pay attention to personal hygiene, do a good job to prevent the spread of the disease measures.