What is hamstring injury?
Hamstring injuries are tears to the tendons or large muscles at the back of the thighs. They are common among athletes.
The hamstrings are tendons (tough fibres) at the back of the thighs that attach the large muscle of the thigh to the bone. 
The hamstring muscle spans the thigh, starting just below the buttocks, connecting the pelvis to the leg below the knee. Hamstring muscles are not used much when we stand or walk, but are very active when we run, jump and climb, when we need to bend the knee.
Symptoms of a hamstring injury
Sudden lunging, running or jumping can cause the hamstring tendons or muscles to tear, which can be felt or heard as a pop and will be immediately painful. The muscle will spasm (seize up) and feel tight and tender. In severe cases, there will also be swelling and bruising.
The degree of pain and other symptoms depend on the severity of the tear. Tears range from a grade one tear, which is just a minor strain, to a grade three tear, where the muscle completely ruptures. This causes severe pain and prevents you from doing any activity for several months.
Hamstring injuries are often seen in athletes and sportsmen, such as footballers, and recurring injury is common.
Treating hamstring injury
Hamstring injury is usually treated with:
- oral medications
- physiotherapy
- shockwave therapy
Rest and recovery
You should recover fully from a hamstring injury if you rest until it feels better. Recovery time may be days, weeks or months depending on the severity of the tear.
Resting means not doing any running or jumping sports during this time, although you can walk, swim and cycle if the pain allows you to.
Pain and any swelling can be relieved by raising your leg and cold compress to your affected thigh.
Gentle exercises and stretches
It’s important that you don’t stay inactive for too long, as this will cause the hamstring muscles to shrink and scar tissue to form around the tear.
As soon as the pain subsides, after resting for several days, you should start to do regular gentle hamstring stretches.
This should be followed by a programme of gentle exercise (such as walking and cycling) and hamstring strengthening exercises.
You should only return to activity when your hamstring muscles are strong enough, to avoid injuring yourself again. When you want to start running again, reintroduce it into your exercise programme gradually.
It is important to warm up and stretch before you start exercising. If the pain returns, stop immediately.
