The diagnosis is based on symptoms and physical examination by the physician.
In almost all cases this will be the GP, because he is the one who sees patients with tennis elbow first.
He bases his diagnosis on the presence of the following three characteristics:
Pain 1 on the outside of the elbow
2 Press Pain at the site of the attachment of the 'common extensor tendon' (joint extensor tendon).
3 Worsening of symptoms by tightening the forearm extensor muscles.
The latter characteristic is known as a resistance test.
Here, the patient is moving the hand up at the same time this is stopped by the physician.
If the pain provoked, the resistance test positive.