I attended a fantastic online course recently with Dr. Brinda Christopher covering tendinopathy injuries.
65-80% of our tendons are made up of type 1 collagen but following injury (one off or repetitive) we develop type 3 collagen causing the tendon to become weaker and less efficient. Another factor that causes pain following injury is neovascularisation (an increase in nociceptive pain nerve fibres).
Tendon injuries can affect many areas such as inner and outer elbow (also known as medial and lateral epicondylitis - tennis and golfers elbow), supraspinatus (rotator cuff shoulder), Achilles tendon, patella tendon (knee) and various other areas of the body.
There is evidence to suggest prescriptive exercise and other modalities can have a beneficial effect at stimulating type 1 collagen fibres and reducing the neovascularisation. As well as modifying your activities.
There are many stages of tendon injury....from a one off acute overload to a continued overload and long term degeneration. It's important to work out which stage you're at to follow a programme that is tailored to you.
There are many causes to tendonopathy injuries such as a sudden change of training patterns, trauma (fall), repetitive strain, muscle imbalance however most will be discussed during a physiotherapy session.