takes place when acetylcholine "cannot activate the receptor sites at the neuromuscular junction."
She told her followers that this was causing the "blocking and binding in my system."
In the second Story, Jenelle revealed that she "was in the hospital all day" for her "chest pain."
She asked her fans to "please just send prayers."
MORE HEALTH SCARES
Jenelle had been updating fans on her health in the weeks leading up to the hospitalization.
The Teen Mom star revealed she had been diagnosed with fibromyalgia in a recent interview with .
According to the , fibromyalgia is a condition that causes pain all over the body, sleeping problems and fatigue.
An individual with fibromyalgia is more susceptible to pain and the condition can cause emotional and mental distress.
Jenelle told the outlet: "My entire body gets in so much pain and sometimes I lay in bed and cry.
"For a long time, no one believed my symptoms until I got a second opinion from a new neurologist recently."
She added: "I now know why my body is acting the way it does and it explains a lot.
"I never knew what fibromyalgia was until my doctor diagnosed me."
Jenelle is married to David Eason, 33, and they share a 5-year-old daughter, Ensley.
Meanwhile, she is also the mother to sons Jace, 12, and Kaiser, 7, with former partners.