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Myasthenia gravis is an autoimmune disease marked by muscle weakness and fatigue. The symptoms are activated when the immune system produces antibodies that interfere with the transmission of nerve signals to skeletal (voluntary) muscle. As a result, the affected muscles cannot contract normally.
There are so many disease where in our immune system produces antibodies for our own tissues. To name few are Insulin Dependent Diabetes Milletus, Rheumatoid Arthritis, Myesthenia Gravis, Multiple Sclerosis, Goodpastures Syndrome, Graves Disease etc.
In adults, ITP is considered an autoimmune disorder, which means that the body produces antibodies that damage some of its own products--in this case, blood platelets. Some adults with chronic ITP also have other immune system disorders.
Elevated antinuclear antibodies (ANA) can indicate various autoimmune diseases, such as lupus, rheumatoid arthritis, or Sjögren's syndrome. It can also be elevated in chronic infections, certain medications, or in individuals with a family history of autoimmune disorders. Further evaluation by a healthcare provider is needed to determine the underlying cause of the elevated ANA levels.
Hashimoto's Thyroiditis
Grave's Disease and Hashimoto's thyroiditis are two that I know of. Grave's tends to have a steady stream of hyperthyroid symptoms while in Hashimoto's tyroiditis it might start out hyperthyroid and as the antibodies attack it will eventually dwindle down to hypothyroidism. Somtimes there will be bursts of hyperthyroid behavior as the thryoid gland is destroyed by antibodies in Hashimoto's thryoiditis.
Crohns disease
A chronic autoimmune disease that affects the neuromuscular junction is myasthenia gravis. It leads to fluctuating muscle weakness and fatigue.
Sjogren's syndrome is an autoimmune disease that causes chronic dry mouth and eyes.
Lupus is a chronic, inflammatory, autoimmune disease that can affect any part of the body including the thyroid. People who have one autoimmune disease usually have other autoimmune diseases in overlap. It is possible for lupus to affect the thyroid, but autoimmune thyroid disease like Hashimoto's thyroiditis could be responsible.
Crohn's disease.
Most common symptoms of autoimmune disease are chronic gastrointestinal symptoms, extraintestinal symptoms and systematic failure, like a skin deformation in various locations.