Nursing care
Amyotrophic Lateral Sclerosis nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 6 min read · Updated September 2026
Short answer
Amyotrophic lateral sclerosis is a progressive motor neurone disease that destroys the nerves controlling voluntary muscle movement while leaving cognition intact for most patients. Nursing care centres on protecting the airway, supporting communication, and managing the psychological weight of a fully aware mind trapped in a failing body. Assessment tracks respiratory function and swallow safety above all else.
What it is and why it happens
Amyotrophic lateral sclerosis destroys both upper and lower motor neurones in the brain and spinal cord. As these neurones die, the muscles they supply lose their nerve signal, weaken, and eventually waste away. The disease does not touch the sensory pathways and, in the majority of patients, does not touch cognition. The person understands exactly what is happening to them, at every stage, which is the fact that shapes almost every other decision on this page.
Most cases are sporadic, with no identified cause. Around five to ten per cent are familial, linked to mutations including SOD1 and C9orf72. Onset is typically between 40 and 70 years, and the course is relentlessly progressive — there is no remission, no plateau that lasts. Median survival from diagnosis is two to five years, though a minority live substantially longer, and death usually comes from respiratory failure rather than the disease itself.
How it presents — what you will actually see
Presentation depends on which motor neurones fail first. Limb-onset ALS starts with asymmetric weakness — a foot drop, a hand that fumbles buttons, cramping that does not resolve with rest. Bulbar-onset ALS starts in the muscles of speech and swallowing: slurred words, a change in voice quality, coughing on thin liquids before solid food becomes a problem. Both patterns eventually converge as the disease spreads.
Look for the combination of upper and lower motor neurone signs together, which is the clinical fingerprint of ALS. Lower motor neurone damage gives you weakness, muscle wasting, and fasciculations — visible twitching under the skin, often first noticed in the tongue or a calf. Upper motor neurone damage gives you spasticity and hyperreflexia in the same limbs that are wasting. Sensation stays normal throughout, and bladder and bowel control is preserved until very late, which distinguishes ALS from many other neurological conditions your patient may have researched online.
Nursing assessment priorities
Respiratory status is the assessment that determines survival, and it must be tracked longitudinally, not just at admission. Ask about orthopnoea, morning headaches, and disturbed sleep — early signs of nocturnal hypoventilation that precede daytime breathlessness. Forced vital capacity and negative inspiratory force, where available, give an objective trend; a falling FVC matters more than any single reading.
Swallow safety is the second priority. Watch for coughing during meals, wet or gurgly voice quality after swallowing, prolonged mealtimes, and weight loss — all point toward aspiration risk before a formal swallow study confirms it. Assess speech intelligibility and the patient's current communication method, because this changes fast and a plan that worked last month may not work today. Finally, assess mood directly. Depression is common and frequently under-reported because the patient is focused on physical decline, and pseudobulbar affect — involuntary laughing or crying disconnected from mood — is easily mistaken for emotional distress rather than the neurological sign it is.
Interventions and what to do first
Airway and breathing take priority whenever respiratory findings are new or worsening. Position upright, escalate for non-invasive ventilation assessment if ordered, and involve respiratory therapy early rather than waiting for a crisis — planned initiation of BiPAP has better outcomes than emergency intubation. Discuss ventilation preferences with the patient while they can still participate fully in that conversation; this is not a discussion to defer.
For swallowing, modify diet texture per the speech and language therapist's assessment and position the patient upright for all oral intake, with the head kept upright for a period afterward. Raise the topic of a gastrostomy tube before it becomes urgent — placed while respiratory function is still adequate, it is a safer procedure and one the patient can consent to with full understanding of the trade-off.
Communication support should start the moment speech becomes effortful, not after it fails. Introduce a communication board, text-to-speech app, or eye-gaze system while the patient can still learn and practise with it. Waiting until speech is gone removes the chance to build fluency with the new tool while some verbal backup remains.
Complications to watch for
Aspiration pneumonia is the complication that most often turns a slow decline into an acute admission. It follows silently from the swallowing deficits already present, so any new fever, productive cough, or drop in oxygen saturation in a patient with known dysphagia should prompt immediate assessment rather than a wait-and-see approach.
Respiratory failure is the eventual cause of death in most patients and can arrive gradually or, during an intercurrent chest infection, acutely. Skin breakdown is a real risk once mobility is lost, given intact sensation makes pressure injuries painful as well as dangerous — turn schedules and pressure-relieving surfaces matter as much here as in any immobile patient. Malnutrition and dehydration develop quietly when swallowing difficulty reduces intake, and weight should be tracked at every contact, not just when the patient reports a problem.
Patient teaching before discharge
Teach the family to recognise early signs of respiratory decline — morning headache, daytime sleepiness, breathlessness on minimal exertion — so ventilation support is sought before an emergency, not during one. Cover safe swallowing techniques concretely: chin-tuck positioning, thickened liquids if prescribed, and small bites with time to clear each mouthful before the next.
Discuss advance care planning honestly and early, while the patient can direct it themselves. Because insight and judgement remain intact throughout ALS, the patient is entitled to lead decisions about ventilation, feeding tubes, and resuscitation status for as long as possible — deferring these conversations does not protect the patient, it removes their voice from decisions about their own body. Point families toward practical support: home health services, equipment loan programmes, and caregiver respite, since caregiver burnout is common in a disease this demanding and this long.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our neurological practice questions are the closest set to what this page covers.
Common questions
Does ALS affect memory or thinking?
In most patients, cognition stays intact throughout the disease, even as physical function declines completely. A minority develop frontotemporal changes or ALS-related cognitive impairment, so cognitive status should still be assessed rather than assumed, but it is not the expected course.
What is the first sign of respiratory involvement in ALS?
Nocturnal symptoms usually appear first — disturbed sleep, morning headache, and daytime fatigue from overnight hypoventilation — often before the patient reports breathlessness while awake. Ask about these directly at every review, because patients rarely volunteer them unprompted.
Why is a gastrostomy tube offered early in ALS rather than when swallowing fails completely?
Placement is safer and better tolerated while respiratory function and nutritional status are still adequate. Waiting until dysphagia is severe increases procedural risk and often means the patient is already malnourished by the time the tube goes in.
How do you tell pseudobulbar affect from genuine emotional distress in ALS?
Pseudobulbar affect produces laughing or crying that is exaggerated, sudden, and disconnected from the patient's actual mood — they may report feeling neutral while crying uncontrollably. Ask the patient directly how they feel underneath the outward expression; the mismatch is the clue.
What is the leading cause of death in ALS?
Respiratory failure, either as a gradual endpoint of progressive muscle weakness or precipitated acutely by an intercurrent chest infection such as aspiration pneumonia. This is why respiratory assessment is the single highest-priority nursing task throughout the disease.