Infra-red rays are electromagnetic waves, the heat energy obtained from the rays are used to relieve pain.
Infra-red Rays Generators (2 types)
(http://www.blacktonature.com/image/data/fir.jpg)
Non-Luminous Generator
Luminous Generator
Where useful?
1. Pain
2. Muscle strain and pain
Where it should not be used?
1. Defective Blood Supply to the area (eg. In case of diabetes)
2. Any Blood loss
3. Defective skin sensation (nerve damage)
Advantages
1. Relief of Pain
2. Muscle relaxation
Disadvantages
1. Burns
2. Electric Shock
3. Overdose headache
4. Injury to eyes
5. Faintness
Source: medindia