Quite obviously yes. If you don't use it you lose it simple as that.
NASA does experiments with people lying in bed for up to 3 months at a time, as a way to simulate the effect of weightlessness on astronauts. They say that the effects of 3 months in bed "aren't pretty", and the participants end up with muscle and even bone density loss.
diuse atrophy (muscle loss or weakness from lack of use)
Muscular dystrophy is a group of inherited disorders that involve muscle weakness and loss of muscle tissue, which get worse over time.
If you don't attack it, it gets worse.
Congenital myopathy causes loss of muscle tone and muscle weakness in infancy and delayed motor skills, such as walking, later in childhood.
Barbiturates can cause Stevens-Johnson syndrome. Other negative effects include bone pain, tenderness, loss of appetite, muscle weakness and yellow eyes or skin.
Addison's Disease
The disorder is characterized by unsteady gait, slurred speech, absent knee and ankle jerks, Babinski responses, loss of position and vibrations senses, leg muscle weakness, loss of leg muscle mass.
The main features of NM are muscle weakness, loss of muscle tone, and absent or weak deep tendon reflexes (for example, knee and ankle jerks).
Many SLE patients have fevers, fatigue, muscle pain, weakness, decreased appetite, and weight loss.
Adrenoleukodystrophy (ALD) affects the myelin of the central nervous system. Symptoms can vary a great deal making diagnosis difficult but include weakness of muscle tone, aphasia, strabismus, hearing loss and worsening muscle weakness and leg stiffness.
No, Weight loss does not cause muscle loss. Weight loss and muscle loss is little bit different. Typically, when you want to “lose weight,” you mean you want to lose fat while maintaining as much muscle as possible. If you’re losing muscle and not fat, then you may need to make some changes to your diet and exercise to counteract this.
Schizophrenia itself does not involve those symptoms, but the medications associated with schizophrenia can cause weakness and loss of consciousness. Please see your doctor immediately if you lose consciousness without any evident non-serious cause.