Yoga is practised by millions of people in India for reasons that have nothing to do with hospitals. But because so many of our patients ask whether it will help their condition, it is worth setting out, plainly, what the medical evidence shows - where yoga has real, measurable benefits, where the evidence is thin, and when it needs care.
What yoga is, from a medical point of view
Stripped to its physical components, a typical yoga practice combines three things: sustained postures that build strength, balance and flexibility; slow, controlled breathing; and focused attention or meditation. Each of these has been studied separately, and their combination explains most of the benefits below. The style matters less than doing it regularly.
Benefits with good evidence
Low back pain
This is the best-established benefit. Several large trials have found that a structured yoga programme reduces chronic low back pain and improves function about as well as conventional physiotherapy exercise, with effects lasting months. It is now included in several international guidelines for chronic back pain.
Blood pressure and heart risk
Regular practice that includes breathing and relaxation lowers blood pressure by a small but meaningful amount - typically a few millimetres of mercury in people with high blood pressure - and modestly improves cholesterol and blood sugar. This is an addition to medicines and a good diet, not a replacement. For people with atherosclerosis or risk factors for it, yoga is a reasonable part of the plan.
Stress, anxiety and sleep
Slow breathing and meditation reliably reduce measures of stress and mild anxiety, and improve sleep quality in people with insomnia. The effect is comparable to other relaxation methods; the advantage of yoga is that many people keep doing it.
Flexibility, balance and strength
Improvements are consistent and matter particularly in older adults, where better balance means fewer falls.
Benefits with promising but limited evidence
Irritable bowel syndrome and digestive symptoms
Small trials suggest yoga reduces the severity of IBS symptoms, probably through its effect on stress and the gut-brain connection, and gentle twisting postures and walking-type movement help some people with bloating and constipation. It is a reasonable thing to try alongside standard treatment for IBS; it is not a treatment for inflammatory bowel disease or for any condition that needs investigation.
Weight, fatty liver and diabetes
Yoga alone burns relatively few calories, but as part of a programme with diet changes it supports weight loss and improves blood sugar control in type 2 diabetes. For fatty liver, the key is total physical activity and weight loss; yoga counts, but brisk walking or cycling adds more.
Reflux and heartburn
Diaphragmatic breathing may reduce reflux episodes in some people. Avoid inverted postures (headstand, shoulder stand) and deep forward bends soon after meals if you have reflux - they make it worse.
Where to be careful
- Hernia, recent abdominal surgery, or a large varicose vein problem: avoid postures that strain the abdomen or hold the breath under pressure until your surgeon clears you.
- Uncontrolled high blood pressure, glaucoma, or recent eye surgery: avoid inversions.
- Neck or spine disease, osteoporosis: some postures need modifying; tell your instructor.
- Pregnancy: prenatal classes only, with a qualified teacher.
- Any new or unexplained symptom: yoga is not a way to avoid a diagnosis.
Injuries from yoga are uncommon but real, and nearly always come from pushing into pain or attempting advanced postures too early. Stop at discomfort, not beyond it.
How to start
Twenty to thirty minutes, three to five times a week, is enough to see the benefits above within two to three months. A beginner's class with a trained teacher is worth it for the first few weeks so that the basic postures are learnt safely. If you have a medical condition, tell the teacher, and if you are unsure whether a posture is safe for you, ask your doctor - it is a quick question.
