Isaacs Syndrome is a neuromuscular disease that is rarely found. In Isaacs Syndrome patients have muscles fiber contractions and it happens continuously in your age.

Other names:

Isaacs syndrome have various name other than this.

Acquired Neuromyotonia
Continuous Muscle Activity Syndrome
Continuous Myokymia
Gamstorp Wohlfart Syndrome
Isaacs Mertens Syndrome
Isaacs Pseudomyotonia Syndrome
Myokymias
Pseudomyotonia Syndrome of Isaacs
Quantal Squander
Syndrome of Continuous Muscle Activity

Causes may include:

1. Immune system disorders
   
2. Gold or mercury etc. toxic exposures.
   
3. Lung tumors may cause of Isaacs Syndrome.
   
4. Genetic disorders

1. Muscles become weak.
   
2. Continuous or intermittent twitching
   
3. Progressive stiffness
   
4. Increased sweating
   
5. Slurred speech
   
6. Difficulty in chewing and swallowing