But there are some pretty serious causes for back and hip pain as well. Lower back pain, in particular, can be a sign of various serious conditions such as advanced kidney infections or a condition called interstitial cystitis, which can cause inflammation of the tissues of the bladder. Sciatica causes lower back pain, pain in the back of the knee, pain in right buttock cheek, unilateral (one-sided) pain, thigh pain, pain behind the knee and calf, and muscle weakness in legs as well.

The hip flexors are the group of muscles that allow you to lift your knees toward your chest and bend forward from the hips.  What is collectively referred to as the hip flexors is actually a group of muscles that includes the iliopsoas, the thigh muscles (rectus femoris, Sartorius and tensor fasciae latae), and the inner thigh muscles (adductor longus and brevis, pectineus and gracilis).

Cauda equina syndrome can be causes by spinal birth defects in children or, in adults, falls, inflammation, malignant tumors, injuries, or, and this is the most prevalent cause—a ruptured disc in the lumbar region of the spine. Symptoms of cauda equina include radiating pain in the lower back, pain and numbness in the legs and lower back, weakness in the lower body, loss of sexual function, and loss of bladder control. Another prominent symptom is upper leg pain, sharp pain in the thigh, loss of sensation in the upper leg muscles, and inner thigh pain. It is critical to seek immediate medical care and often including a neurosurgery consultation,
If most inner-thigh openers feel too easy (and your ankles and knees are injury-free), try Frog Pose. Get down on all fours, with palms on the floor and your knees on blankets or a mat (roll your mat lengthwise, like a tortilla, and place it under your knees for more comfort). Slowly widen your knees until you feel a comfortable stretch in your inner thighs, keeping the inside of each calf and foot in contact with the floor. Make sure to keep your ankles in line with your knees. Lower down to your forearms. Stay here for at least 30 seconds.
A few cancers in their early stages can be hard to tell apart from ordinary back pain — a bone cancer in the vertebrae, for instance — and these create a frustrating diagnostic problem. They are too rare for doctors to inflict cancer testing on every low back pain patient “just in case.” And yet the possibility cannot be dismissed, either! It’s an unsolveable problem.
Sacroiliitis is an inflammation of one or both of the sacroiliac joints, the spot where the lower spine connects to the pelvis. Sacroiliitis can cause pain in the buttocks, lower back, and may even extend down one or both legs. The pain can worsen with prolonged standing or climbing stairs. Sacroiliitis can be caused by arthritis, injury, pregnancy, or infection.
The main work of your hip flexors is to bring your knee toward your chest and to bend at the waist. Symptoms associated with a hip flexor strain can range from mild to severe and can impact your mobility. If you don’t rest and seek treatment, your hip flexor strain symptoms could get worse. But there are many at-home activities and remedies that can help reduce hip flexor strain symptoms.
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