Now those who just can't stop chatting into their handsets are facing a new menace - mobile phone elbow.
Known in medical jargon as "cubital tunnel syndrome", sufferers experience weakness in their hands and have difficulty opening jars, typing, writing or playing instruments.
Users who hold the phone to their ear for long periods are at risk of developing a painful condition in their arm.
By bending their elbow too tightly, and for too long, they could overextend a main nerve.
As well as being painful, this can lead to tingling or numbness from the elbow to the fingers.
Orthopaedic specialists say they are seeing increasing numbers of patients with the condition.
They are advising mobile users to switch the handset from hand to hand every so often to prevent it.