Hamstring Injury

Overview

Your hamstrings are three strong muscles that run down the back of your thigh, from your hip to just below your knee. They help you bend your knee, pull your leg back, and control your stride when you walk, run or jump. A hamstring injury means one or more of these muscles has been overstretched or torn. Doctors call this a 'strain' or a 'pulled muscle'. It can be a mild stretch with a few sore fibres, or a bigger tear — but most heal well with time and gentle exercise.

Yes. Hamstring strains are among the most common muscle injuries in sport, and they also happen in everyday life — for example after a slip, a stumble, or lifting in an awkward position.

Anyone can get one. They are most common in people who run, sprint, play football, rugby, basketball or tennis, and in dancers. Older adults are more at risk from slips and falls, and teenagers can injure hamstrings during growth spurts, when muscles and bones grow at different rates.

Symptoms

Common symptoms

• A sudden sharp pain or 'pull' at the back of the thigh
• A snapping or popping feeling at the moment of injury
• Tenderness when you press the back of the thigh
• Bruising that may appear a day or two later, sometimes lower down the leg
• Swelling or a feeling of tightness in the thigh
• Weakness in the leg, or the leg feeling like it might 'give way'
• Pain when bending the knee against resistance, or when straightening the leg
• Limping, or pain when walking, climbing stairs or sitting for a long time

Causes

Main causes

• Sprinting or speeding up quickly, especially when the muscle is tired
• Kicking or stretching the leg out with force
• Sudden stops, twists or slips
• Lifting something heavy with the legs in an awkward position
• Using cold muscles that have not been warmed up

Risk factors

• A previous hamstring injury — this is the biggest risk factor
• Sports that involve sprinting, jumping or kicking
• Weak or tired hamstring and buttock muscles
• Muscle tightness, or a big difference in strength between the two legs
• Increasing training load too quickly, or not getting enough recovery between sessions
• Being older, or being a teenager in a growth spurt
• Cold weather and hard or slippery ground

When to see a doctor

See a doctor urgently if:

• You cannot bear weight on the leg, or you cannot walk more than a few steps
• You heard or felt a pop or snap and the pain is severe
• There is a visible dent, gap or lump at the back of the thigh
• Bruising is spreading quickly, or the thigh is very swollen and tight
• You have numbness, tingling, or the leg looks pale or feels cold
• The pain is getting worse rather than better after a few days

Book a routine appointment if:

• The pain is mild but has not improved after one to two weeks
• You keep getting hamstring pain when you exercise
• You want advice on a safe return to sport or heavy work
• You have had hamstring injuries before and want to reduce the risk of another one

Diagnosis

A doctor or physiotherapist can usually work out what is going on by asking how the injury happened and gently feeling the back of your thigh. They will check where it hurts, whether you can tighten the muscle, and how far you can straighten and bend your knee. They may also watch you walk or do a light stretch.

Tests that may be done

• Most people do not need any tests.
• An ultrasound scan may be used to see the size and place of a tear.
• An MRI scan may be suggested if the injury is severe, is not healing as expected, or if surgery is being considered.
• An X-ray may occasionally be done to check the bone if the tendon may have pulled away from it.

What to expect at your appointment

The appointment is usually quick and does not hurt much. The clinician will ask you to relax the leg, then to tighten the muscle gently against their hand. Wear or bring shorts so your thigh can be examined comfortably.

Treatment

Most hamstring injuries heal with time and a step-by-step exercise programme. The first few days focus on calming pain and swelling. After that, you gradually build strength and control before returning to sport or heavy activity. The balance matters: too much rest can leave the muscle weak, and too much activity too soon can cause re-injury.

Self-care at home

• Rest the leg from sport and hard activity for the first few days, but keep moving gently around the house.
• Use an ice pack wrapped in a cloth for up to 15–20 minutes at a time, a few times a day, for the first 48–72 hours.
• A soft bandage or compression sleeve can help with swelling — it should feel snug, not tight.
• Raise the leg on pillows when sitting or lying down to help with swelling.
• Start gentle, pain-free movement, such as a light walk or slow knee bends, as soon as it feels comfortable.
• Avoid hard stretching or deep massage in the first few days.
• Only use pain relief you have checked with a pharmacist or doctor, and follow the label. Some painkillers can hide pain and tempt you to do too much.

Medical treatments

A physiotherapist can guide you through a rehabilitation programme, and this is the main treatment — it works well. It usually starts with gentle movement and builds up through strengthening exercises for the hamstrings, buttocks and core, along with balance work and running drills. Your clinician may also discuss hands-on therapy, taping or a staged return-to-sport plan. Any pain relief should be discussed with a pharmacist or doctor; there is no specific medicine that speeds up muscle healing.

When is surgery considered?

Surgery is rarely needed. It may be considered if the tendon has pulled completely away from the bone (an avulsion), particularly for people who need full strength for sport or work, or for a large tear that is not healing. Your doctor would discuss this with you and refer you to a specialist.

Living with this condition

For the first week or two, everyday things like sitting for long periods, driving, climbing stairs or getting in and out of a car may be uncomfortable. Try short walks, change position often, and use a cushion if sitting is sore. Build activity back gradually and follow the plan your clinician gives you rather than pushing through pain.

Lifestyle tips

• Keep up gentle movement — total rest is not helpful after the first few days.
• Sleep well and eat enough protein to support muscle repair.
• Avoid alcohol in the early days if it affects your sleep or makes you feel worse.
• Return to sport in stages, and only when your clinician or physiotherapist agrees.

Diet and exercise

There is no special diet for a hamstring injury, but eating regularly and including protein with meals — such as beans, eggs, fish, dairy or tofu — supports muscle repair. Staying hydrated helps too. Exercise should be gradual: start with easy walking and range-of-movement exercises, then add strengthening work. Only return to running, sprinting or sport when you have full, pain-free strength and your clinician is happy.

Mental health and emotional wellbeing

Being sidelined can be frustrating. It is normal to feel anxious about re-injury, or low if you cannot do the sport or activity you love. Tell someone how you feel. If worry, low mood or anxiety is affecting your daily life, speak to your doctor — support is available. If you ever have thoughts of harming yourself, contact your local emergency number or a crisis support line straight away.

Prevention

You cannot prevent every injury, but you can lower your risk a lot. Regular strengthening of the hamstrings and buttocks, a proper warm-up, and increasing training slowly are the most effective steps. Many sports teams use a short programme of strengthening exercises, such as Nordic hamstring curls, as part of their warm-up — this has been shown to reduce hamstring injuries.

Screening programmes

There is no routine screening test. If you have injured a hamstring before, a physiotherapist can check your strength and movement and help you plan a safe return to activity.

Complications

If left untreated

• A longer recovery and ongoing weakness in the leg
• A higher chance of tearing it again, sometimes worse than the first time
• Scar tissue that makes the muscle feel tight or sore
• Trouble with sprinting, kicking or sudden movements
• Rarely, the tendon can pull a piece of bone away, which may need specialist care

Long-term outlook

Most hamstring injuries heal well. Mild strains often settle within one to three weeks, and bigger tears can take a few months. With a steady rehabilitation programme and a patient return to activity, most people get back to their normal sport and daily life. Healing is not always a straight line — small set-backs are common and can usually be managed by easing off for a few days.

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