Many people experience a sudden, sharp, electric shock-like pain in the rectum, colloquially known as 'lightning bum.' While jarring and intense, this brief sensation—often lasting only seconds—is a common, though frequently underreported, symptom.
GP Dr. Hana Patel explains that 'lightning bum' is medically associated with spasms of the anal or pelvic floor muscles. It can feel like an abrupt, severe muscle cramp that radiates to the tailbone, lower abdomen, or legs before quickly fading. While distinct from 'lightning crotch' (which is focused in the lower pelvis or vagina), the two can share similar causes.
Although it can affect anyone, the symptom is reported more often by women. Dr. Patel notes this is likely due to gynecological conditions, hormonal influences on pelvic nerve sensitivity, and pregnancy-related changes.
While often benign, persistent ‘lightning bum’ pain can sometimes signal an underlying health issue. Dr. Patel outlines six potential causes:
1. **Proctalgia Fugax:** A brief, intense spasm of the anal sphincter muscle, affecting up to 18% of adults. It is not dangerous and can be managed with warm baths, gentle stretching, or muscle relaxants if needed.
2. **Endometriosis:** When tissue similar to the uterine lining grows outside the uterus, it can irritate nerves near the rectum, causing cyclical pain that often flares during menstruation.
3. **Pelvic Floor Dysfunction:** Involuntary spasms of the pelvic floor muscles, which may be improved with targeted physiotherapy.
4. **Irritable Bowel Syndrome (IBS):** Bowel sensitivity and spasms associated with IBS can sometimes manifest as sharp rectal pain.
5. **Nerve Compression:** A pinched nerve in the lower back or pelvis can send sharp, referred pain to the rectal area, potentially requiring physiotherapy, medication, or in rare cases, surgery.
6. **S.e.x.u.a.l.l.y Transmitted Infections (STIs):** Infections like gonorrhea, chlamydia, or herpes can cause rectal inflammation, nerve irritation, and pain, especially if other symptoms are present.
Dr. Patel advises that while an occasional episode may not be cause for concern, anyone experiencing frequent, severe, or persistent 'lightning bum' pain should consult their GP. A medical professional can help identify the root cause and recommend an appropriate treatment plan.
