While the majority of people can benefit from a massage in one way or another, there are few instances when it would be best to avoid it. These include viral infections, such as the flu, a fever or a cold as well as any post-operative period as directed by your surgeon and/or physician. People with eczema or contagious skin infections and lesions are also advised to avoid getting massaged as the lotions and excessive rubbing may cause the skin to tear.
Most health conditions simply require for minor adjustments to the massage technique. Upon sharing your medical history with your therapist he/she will know how to work on you to avoid causing any harm and alleviate some (if not all) of your aches and pains. Talk to your therapist and they can advise you about your specific needs.