Table 2: Causes of proximal muscle weakness.

Myopathy
 Endocrinopathy (e.g., thyrotoxic periodic paralysis)
 Inflammatory (e.g., myositis)
 Infective (e.g., viral hepatitis or human immunodeficiency syndrome)
 Genetic (e.g., muscular dystrophy or metabolic storage disorders)
 Malignancy-associated
 Drug-induced (e.g., statins, corticosteroids or alcohol)
 Others
Nervous system disorder
 Motor neuropathies
 Peripheral nerve disease (e.g., tick paralysis or demyelinating disorders)
 Neuromuscular junction disorders (e.g., Myasthenia gravis or botulism)