1. Lumbar muscle strain or lumbar spine problems: Prolonged poor posture, excessive labor, or sports injuries may lead to lumbar muscle strain, lumbar disc herniation, or lumbar spinal stenosis, causing lower back pain and possibly accompanied by radiating pain or discomfort in the lower abdomen.
2. Urinary system stones or infections: Kidney stones, ureteral stones, and other urinary system stones, as well as urinary tract infections, prostatitis, and other inflammations, can cause severe lower back pain and lower abdominal pain. The pain may be intermittent or persistent, and may be accompanied by symptoms such as frequent urination, urgency, and pain.
3. Gastrointestinal diseases: such as acute gastroenteritis, peptic ulcers, intestinal spasms, etc., may cause lower abdominal pain, and in some cases, this pain may radiate to the waist, causing a feeling of lower back pain. Intestinal obstruction, appendicitis, etc. may also cause similar symptoms.