Skeletal muscle channelopathies and myotonic disorders constitute a heterogeneous group of neuromuscular conditions caused by mutations that impair the function of ion channels, including sodium and ...

Parkinson’s disease is a disorder of the central nervous system that gets worse over time with no cure. Because it targets the nervous system, it impairs movement. ‌Rigidity is one of the leading ...

Tight and rigid muscles are often the result of injury. Sometimes, muscle tightness and rigidity can occur with other symptoms, such as muscle pain and spasms, or reduced mobility. Mild muscle ...

Work out enough and you’ll soon encounter muscle tightness, but what causes it and can it be treated or avoided? When you purchase through links on our site, we may earn an affiliate commission.

Tight muscles are no fun, but happen to the best of us every now and then -- especially after long days sitting stationary in a chair, hard-earned workouts or strenuous activity that's caused our ...

Stiff person syndrome (also known as SPS, Moersch-Woltman syndrome, and stiff man syndrome) is a very rare condition that can cause your muscles to become rigid or spasm. This is a progressive ...

Depending on the cause, physical therapy, massage, stretching, yoga, relaxation, heat, or other therapies may help release chronically tight muscles. Various factors can cause chronically tight or ...

Muscle relaxers help reduce muscle stiffness and pain from conditions like cerebral palsy and lower back pain. There are two main types of muscle relaxers: antispastics and antispasmodics. Muscle ...

Muscle tightness is a feeling you’ll know all too well if you’ve pushed yourself that little bit harder while training. Some consider it to be the hallmark of a full-blooded workout while to others, ...

Panel A shows the microscopic myoarchitecture of the circular and longitudinal muscle layers of the lower esophageal sphincter and stomach. The circular muscle fibers of the esophagus cross each other ...