The numbers are staggering, ranking right up there with cancer and heart disease.
Estimates say 23 million to 50 million people could be impacted with auto-immune diseases.
When Talia Mariani, a busy personal trainer, started to lose hair and gain weight, she suspected something was wrong.
"My metabolism had already crashed at that point," she said.
Mariani said medical tests revealed she suffered from Hashimoto's, an autoimmune disease that attacks her thyroid.
"it's challenging, it's hard," she said.
Hashimoto's is just one of more than 80 different kinds of autoimmune disorders like lupus, rheumatoid arthritis and Celiac disease. They're called autoimmune diseases because patient's immune systems mistakenly attacks parts of their body.
All are more common in women.
Statistics show not only are the diseases frequent in our society, they're increasing.
Watch the video above for more.
they're called autoimmune diseases because patient's immune systems mistakenly attacks parts of their body.