Quick Answer
ALS causes progressive muscle weakness — affecting voluntary movement. Early recognition enables earlier treatment and planning.
Medically reviewed by Dr. Jitendra Prasad Yadav • NMC 8029 • Kathmandu Neurology Clinic & Cognitive Center
Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting motor neurons — causing muscle weakness, atrophy and eventually paralysis. Early recognition enables earlier diagnosis, treatment (riluzole, edaravone) and planning. ALS is fatal but treatment and support improve quality of life.
Early warning signs of ALS
Muscle weakness: progressive weakness — often starts in hands/feet. Muscle atrophy: wasting of muscles — visible muscle loss. Muscle fasciculations: visible muscle twitches — common early sign. Speech problems: slurred speech, difficulty swallowing — bulbar onset. Breathing problems: shortness of breath — respiratory muscle weakness. Clumsiness: dropping objects, tripping — early motor symptoms. Fatigue: excessive fatigue — common early symptom.
ALS symptoms by onset
Limb onset: starts in arms/legs — most common (~70%). Bulbar onset: starts in speech/swallowing — ~25%. Respiratory onset: starts with breathing problems — ~5%. Progressive: weakness spreads — eventually all voluntary muscles. Spared: eye muscles, bowel/bladder — typically spared until late. Sensory: typically spared — pure motor disease. Cognition: most preserved — but some develop frontotemporal dementia.
Diagnosis of ALS
Clinical criteria: progressive weakness + upper and lower motor neuron signs. EMG: shows denervation — confirms lower motor neuron involvement. Exclude mimics: rule out other causes — cervical spondylosis, multifocal motor neuropathy. MRI: brain and spine MRI — exclude structural causes. Blood tests: rule out other conditions — metabolic, autoimmune. El Escorial criteria: diagnostic criteria — revised for accuracy.
Treatment of ALS
Riluzole: first disease-modifying drug — modest survival benefit. Edaravone: antioxidant — slows progression in some patients. Supportive care: breathing support, nutrition, mobility — essential. Multidisciplinary clinic: neurologist, pulmonologist, nutritionist, social worker — comprehensive care. Respiratory support: NIV (non-invasive ventilation) — improves survival and quality of life. Nutrition: feeding tube if needed — maintains nutrition. Palliative care: symptom management, end-of-life care — essential.
When ALS symptoms need evaluation
If you have progressive muscle weakness, atrophy, fasciculations, or speech/swallowing problems — see a neurologist immediately. Early diagnosis enables early treatment and planning.
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When to seek professional evaluation
ALS is evaluated at neurology consultation — because early diagnosis enables treatment and planning.
This guide is educational and does not replace individual medical advice.
Frequently asked questions
Answers reviewed by Dr. Jitendra Prasad Yadav • MBBS, MD (Internal Medicine), FICN (Neurology), FCNV, FIHM • NMC 8029
Migraine is a neurological condition; headache is one feature. Associated symptoms and functional impact are important for diagnosis.
Aura refers to visual, sensory, or speech symptoms that precede the headache in some people. Both types are migraine; the presence of aura may influence management discussion.
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References & Review
Reviewed by Dr. Jitendra Prasad Yadav • Last reviewed: 2026-11-10
- International Classification of Headache Disorders, 3rd edition (ICHD-3).
- Harrison's Principles of Internal Medicine — Neurology sections.
- American Academy of Neurology guidelines for selected conditions (where applicable).
Content is educational and aligns with standard medical references; individual evaluation may vary. External links provide context and do not imply endorsement.