Outer hip pain and lateral hip pain, though typically not cause for alarm (as the hip is not sitting near any major organs like the heart, lungs, kidneys, or liver), can be a sign of a serious bone condition, such as arthritis in the back, rheumatoid arthritis, osteoarthritis, or tendonitis but can also indicate a more serious bone condition like a fracture, labral tear, or conditions such as snapping hip syndrome or osteonecrosis.
So if you're doing abs exercises and you feel like your hip flexors are putting in more work, refocus and dial in on the muscles you're trying to target. It might sound trite to just "think" about a muscle working as you're doing an exercise (for example, thinking about your abs contracting as you do a situp), but it might actually prevent you from mindlessly grinding out reps with poor form.
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.
You may hear a clicking noise when you move your hip, but that sound is not necessarily a hip flexor issue. Siegrist says the clicking isn't generally the hip flexor alone and often comes from a moving part, like the joint. "Maybe there is a loose body in the joint or loose cartilage at the edge of the hip joint that is mechanically getting irritated,” she says.
While leg lifts, certain ab exercises, and even hula hooping can all help work the hips, the hip flexors can still be a tricky part of the body to stretch Kinetics of hula hooping: An inverse dynamics analysis. Cluff, T., Robertson, D.G., and Balasubramaniam, R. School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada. Human Movement Science, 2008 Aug; 27 (4): 622-35.. To get them even stronger and more flexible, try these five simple hip flexor stretches:
The condition is cauda equina syndrome. It involves “acute loss of function of the neurologic elements (nerve roots) of the spinal canal below the termination (conus) of the spinal cord,” where the nerves spread out like a horse (equina) tail. Again, this condition causes symptoms in the “saddle” of the body: butt, groin, inner thighs. BACK TO TEXT
Luckily, you don’t have to quit your day job or forgo spin class to loosen them up. Simply stretching those hips can get your body back in alignment, increase your mobility (and thus your exercise performance) and maybe even ease pesky back pain, Moore says. “Given the amount of time we sit [each] day and the stress we put our bodies under, hip-opening moves are a necessary party of our daily routine.”
Mobility and exercise (e.g., walking, running, stretching, etc.) help to more evenly distribute the forces of impact and weight through this ball-and-socket joint. As people age or find themselves living a more sedentary lifestyle from (e.g., sitting a lot at work), the wear and tear of the hip joint is less distributed, taking place in a smaller area within the socket.
How to do it: Stand up tall while holding onto a sturdy object like a chair, or rest your hands on a wall. Keeping your back straight and core tight, raise one leg up and lift it out to the side and away from your body, keeping your leg straight. Pause for one to two seconds, then return to the start position. That’s one rep. Repeat this movement, alternating sides each time.
Imagine not being able to climb stairs, bend over, or even walk Changes in hip joint muscle-tendon lengths with mode of locomotion. Riley, P.O., Franz, J., Dicharry, J., et al. Center for Applied Biomechanics, University of Virginia, Charlottesville, VA. Gait & Posture, 2010 Feb; 31 (2): 279-83.. All pretty essential if you ask us! But that’s what our bodies would be like without our hip flexor muscles. Never heard of ‘em? It’s about time we share why they’re so important, how your desk job might be making them weaker (ah!), and the best ways to stretch them out.
The space between the spine and the skin that can become infected by bacteria on rare occasions, causing a spinal epidural. This leads to the accumulation of pus in the spine that can put pressure on nerves and bones, causing great pain. A spinal epidural abscess is a rare but serious condition that can cause spinal pain, radiating lower back pain, and pain that runs down one leg. Spinal epidural abscesses can be caused by a wide range of infections such as skin infections, blood stream infections or urinary tract infections. Spinal epidural abscesses can develop after spinal surgery or epidural catheters used to treat post-operative pain. Symptoms include lower back pain when lying down, radiating back pain, hip pain, tingling in the lower extremities, nausea, fever and vomiting. Treatment includes antibiotics, analgesics, anti-inflammatory drugs, and often drainage and surgery.
Tight hip flexors can result in lower back pain, hip pain and injury.  A lot of strain is put on those muscles during activities that involve sprinting and kicking.  For example, runners are more prone to hip flexor injuries because of the small, repetitive movement during running.   But even if you’re not an athlete, hip flexor injuries can occur during everyday activities (for instance, slipping and falling or running to catch a bus).  When those tight muscles are suddenly stretched beyond what they are accustomed to, you might also experience pain in the upper groin region, typically where the hip meets the pelvis.   

Sacroiliac (SI) joint pain is felt in the low back and buttocks. The pain is caused by damage or injury to the joint between the spine and hip. Sacroiliac pain can mimic other conditions, such as a herniated disc or hip problem. Accurate diagnosis is important to determine the source of pain. Physical therapy, stretching exercises, pain medication, and joint injections are used first to manage the symptoms. Surgery to fuse the joint and stop painful motion may be recommended.

I am a science writer and a former Registered Massage Therapist with a decade of experience treating tough pain cases. I was the Assistant Editor of ScienceBasedMedicine.org for several years. I’ve written hundreds of articles and several books, and I’m known for readable but heavily referenced analysis, with a touch of sass. I am a runner and ultimate player. • more about me • more about PainScience.com


During pregnancy a woman’s abdominals get stretched out. There is no way to avoid this with a growing baby. Muscles work most effectively when they are at an optimal length. Not too short and not too long. The lengthening that happens during pregnancy puts the abdominal muscles at a decreased advantage for working. This decreases the amount of support they provide for spinal stability.  
At the very least, the tension and/or spasm in muscles that cross over the hip and attach onto the pelvis can contribute to imbalance, in terms of how strong and flexible each muscle group is in relation to the others. But muscle imbalance in the hips and the spine may make for pain, limitation and/or posture problems. It can also increase the healing challenge put to you by an existing injury or condition, for example, scoliosis.

In order to treat this hip and leg pain, it is important to understand the causes of lower back pain. Amongst people below the age of 60, the most common cause of sciatica is a slipped or herniated disc, in the lower lumbar region of the spine. When a disc is swollen or has moved, it puts pressure on the sciatic nerve, causing discomfort and pain. This tends not to happen instantly, but instead generally develops over time. Other causes include:
• Sciatica. This is inflammation of the sciatic nerve. The largest nerve in the human body, the sciatic nerve runs from the lower part of the spinal cord, through the buttock and down the back of the leg to the foot. The most common causes of sciatica include compression of the nerve where it exists the spine by a herniated disc, or a rupture of one of the structures that cushions the vertebrae in the spine. Sciatica may be felt as a sharp or burning pain that radiates from the hip. It may also be accompanied by low back pain.

Kidney pain, kidney stones, kidney failure, and advanced kidney infections can cause radiating lower back pain, especially pain that affects the lowest ribs in the back and higher buttock area. Kidney issues can also cause pain in the groin area and difficulty urinating. Groin pain in women, especially pregnant women, is a special concern and the patient should be taken to the ER immediately. If you think a kidney issue is causing your back pain, get to an ER—because once a kidney issue is advanced enough to cause back pain, it is usually quite serious.
Deanna is an ACE® certified personal trainer, Balanced Body® Pilates instructor, and NASM® Fitness Nutrition Specialist. She is passionate about inspiring others to lead a healthier lifestyle through fun workouts and healthy food. When she’s not creating new workouts and recipes for her blog The Live Fit Girls she enjoys running with her two dogs and traveling.
Yuri Elkaim is one of the world’s most trusted health and fitness experts. A former pro soccer player turned NYT bestselling author of The All-Day Energy Diet and The All-Day Fat Burning Diet, his clear, science-backed advice has transformed the lives of more than 500,000 men and women and he’s on a mission to help 100 million people by 2040. Read his inspiring story, “From Soccer to Bed to No Hair on My Head” that started it all.
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