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Let's see if we can figure out what's causing your muscle weakness.
Select additional symptoms and we'll narrow your results.

What causes muscle weakness? 41 possible conditions

Muscle weakness happens when your full effort doesn’t produce a normal muscle movement. Learn when it might be a sign of a serious medical condition. Read more

See a list of possible causes in order from the most common to the least.

1

CFS (Chronic Fatigue Syndrome)

Chronic fatigue syndrome (CFS) is a debilitating disorder characterized by extreme tiredness that can't be explained by an underlying medical condition.

Read more »

2

Muscular Dystrophies

Muscular dystrophies are a group of inherited diseases that damage and weaken your muscles over time. This damage and weakness is due to the lack of a protein.

Read more »

3

Dermatomyositis

Dermatomyositis is a rare inflammatory disease. It's an inflammatory myopathy, which is a condition that occurs when your muscles become inflamed.

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4

Polio

Poliomyelitis, or polio, is a highly contagious disease that is caused by a virus that attacks the body's nervous system.

Read more »

5

Low Blood Sodium (Hyponatremia)

Low blood sodium, or hyponatremia, occurs when water and sodium are out of balance in your body. A quick drop in sodium levels can cause weakness, headache, nausea, and muscle cramps.

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6

Osteomalacia

Osteomalacia is a weakening of the bones that can lead to serious health complications. Here's a look at the symptoms and treatment options.

Read more »

7

Concussion

This condition is considered a medical emergency. Urgent care may be required.

Concussions can cause serious symptoms that require medical treatment. A concussion is a traumatic brain injury that results in an altered mental state.

Read more »

8

Low Blood Potassium

Low potassium levels in your blood can cause weakness, fatigue, and abnormal heart rhythms. Find out how to treat hypokalemia.

Read more »

9

Myasthenia Gravis

Myasthenia gravis is a neuromusclar disorder. It results in weakness of the skeletal muscles, and can cause double vision and drooping of the eyelid.

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10

Neuralgia

Neuralgia is severe pain that occurs due to a damaged nerve. The damaged nerve may be anywhere in the body, but it's most common in the face and neck.

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11

Stroke Overview

This condition is considered a medical emergency. Urgent care may be required.

A stroke is a medical emergency that requires immediate medical care. Learn about the signs of a stroke and what to do.

Read more »

12

Slipped (Herniated) Disk

You can have a slipped disk in any part of your spine, from your neck to your lower back. Read more about symptoms, causes, diagnosis, and treatment.

Read more »

13

Graves' Disease

Graves' disease is an autoimmune disorder that causes your thyroid gland to create too much thyroid hormone. Learn the symptoms and your treatment options.

Read more »

14

Rickets

Rickets is a disorder that can develop due to a lack of vitamin D, calcium, or phosphate. Learn about the symptoms, diagnosis, and treatment of rickets.

Read more »

15

Peripheral Neuropathy

Peripheral neuropathy is a disorder that occurs when your peripheral nerves malfunction because they're damaged.

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16

Hypercalcemia

Hypercalcemia is a condition in which you have too much calcium in your blood.

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17

Hypothyroidism

The thyroid gland produces a hormone that controls how your cells use energy (metabolize). Hypothyroidism occurs when the body doesn't produce enough. Untreated, it can cause complications like obesity and heart disease.

Read more »

18

Duchenne Muscular Dystrophy

One of the nine types of muscular dystrophy, Duchenne muscular dystrophy (DMD) is a genetic condition characterized by progressive weakening of voluntary muscles that leads to death. DMD worsens more rapidly than othe...

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19

Mini Stroke (Transient Ischemic Attack)

This condition is considered a medical emergency. Urgent care may be required.

During a transient ischemic attack (TIA, mini stroke) blood stops flowing to the brain for a short period of time. TIA doesn't kill brain cells like a stroke does. TIA causes symptoms that mimic those of a stroke.

Read more »

20

ALS (Lou Gehrig's Disease)

Amyotrophic lateral sclerosis (ALS) is a degenerative disease that affects the brain and spinal cord. It causes loss of control of voluntary muscles.

Read more »

This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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