# Symptoms and stages of ALS
ALS progresses in stages that are not always clearly separated from each other. The course is different for each person: some people have mild symptoms for years, while others see their symptoms worsen much more quickly. This description follows the most common pattern, but variation is substantial.
Early phase
In the early stage, the first noticeable weaknesses appear, often asymmetrical — that is, more pronounced on one side of the body than the other.
**Most common complaints: **
- Muscle weakness in one arm or hand (for example, difficulty fastening buttons, picking things up from a cupboard, writing becomes harder)
- Muscle weakness in one leg (for example, stumbling, difficulty climbing stairs or driving)
- Sometimes weakness in the face, neck or throat (for example, slurred speech or swallowing difficulties, feeling as though you have no control over your mouth)
- Involuntary movements or tremors in muscles (fasciculations) — these are irregular twitches just under the skin
- Stiffness in arms or legs
- Fatigue, particularly in the affected muscles
- Sometimes headaches or neck and shoulder pain
**Effect on daily life:**
In this stage, much is still possible, but activities that require a lot of strength become harder. Many people notice that hobbies (such as sports, crafts or music) become more demanding or need to be adapted. Fine motor skills — such as writing, sewing or cooking — can become difficult. It is possible for someone to still work fully, but must adjust to the idea that something in their body is changing.
**What we know about this stage:**
The early stage lasts on average a few months to a year, but this varies considerably. Some people have a slowly progressive form for much longer (years); others see change more quickly. The median time from first symptom to diagnosis is approximately 8–12 months (source: international ALS registries, 2023), although many people remain undiagnosed for longer. Survival measured from diagnosis (not from the first symptom) is on average 2–3 years for the entire group of ALS patients, but this says nothing about any one person — individuals can live many years longer, especially with slowly progressive forms. These figures are an average across very different people and depend heavily on which muscles are involved and how quickly the disease progresses.
Progressive stage
In this stage, the weaknesses spread: more muscle groups become involved, symmetry becomes more apparent (weakness on both sides of the body), and strength clearly decreases.
**Most common complaints: **
- Increasing muscle weakness in arms and/or legs; activities that were previously difficult now become impossible
- Loss of fine motor skills: writing, eating with cutlery, getting dressed become increasingly difficult
- Spasticity (muscles feel stiff, can be painful)
- Progressive slurred speech or nasal voice quality (speech becomes unclear)
- Difficulty with chewing and swallowing (food must increasingly be finely chopped or pureed)
- Fatigue that becomes more severe
- Sometimes muscle cramps and muscle pain
- Emotional changes: uncontrolled laughing or crying (pseudobulbar affect), not always appropriate to the situation
- Cognitive changes sometimes occur (difficulty with attention or planning) — approximately 10–15% of ALS patients develop more serious cognitive or behavioural changes
- Possible weight loss due to increased difficulty eating
**Effect on daily life:**
Independence decreases. Many people now need help with personal care (washing, dressing), household tasks and/or transport. Working usually becomes impossible. Psychological burden grows: it is difficult to accept that the body is doing less of what you want it to do. Social contacts can become harder, especially if speaking has become difficult. For many families in this stage, everything changes: roles shift, care becomes more intensive.
**What we know about this stage:**
This phase usually lasts 1–2 years, but can be shorter or longer. The speed depends among other things on the type of ALS (spinal onset, bulbar onset or respiratory onset have different progression rates) and genetic factors. For spinal ALS (weakness begins in arms/legs) the median survival after diagnosis is approximately 3 years; for bulbar ALS (onset in speech/swallowing) shorter, on average 2 years — but there are large individual differences (source: international ALS studies, 2022–2023). These figures apply to groups, not to one person. People with great perseverance, good care and adaptations can live longer than average.
Advanced phase
In the advanced phase most large muscle groups are weak. Care becomes intensive, and issues around breathing and nutrition are central.
**Most common complaints: **
- Severe muscle weakness almost everywhere: arms and legs are usually no longer usable without help or technical support
- Inability to sit upright or stand without help
- Severe speechlessness — communication takes place via eye movements, eye-blink code, electronic speech computers or other aids
- Swallowing difficulties that become severe; many people eat via a feeding tube (PEG tube)
- Breathing problems, especially at night or when lying down: shortness of breath, sleep disturbance, morning headache
- Possible inability to cough independently (saliva accumulation can be bothersome)
- Pain due to immobility and contractures (muscles tighten)
- Anxiety and psychological distress: many people worry about what comes next
- Possible loss of control over bowel/bladder
**Effect on daily life:**
Independence is almost completely gone; continuous personal care is needed. Most daily tasks are impossible without help — washing, toilet, eating, communication, everything becomes dependent on others. For many families this is the phase in which professional home care or admission to a hospice or hospital becomes necessary. The question of mechanical ventilation (artificial respiration) becomes relevant and raises dilemmas for many families: do we want this? What does the patient themselves want?
**What we know about this stage:**
This phase begins as the breathing muscles weaken severely. The median survival in this phase, without mechanical ventilation, is several months (usually 3–6 months) — but this varies greatly. With supportive mechanical ventilation (non-invasive ventilation, later possibly invasive ventilation via a tracheostomy) people can live months to years longer, depending on their own choices and health. The average median survival for all ALS patients combined is 2–4 years after diagnosis (source: ALS Association, 2023), but approximately 10% of patients live longer than 10 years. This proves that averages tell individuals little — your personal course can be quite different.
Special forms and variation
**Slow progression:**
Some people have ALS that progresses slowly over years. They may be able to do relatively much still 5–10+ years after diagnosis. This is not predictable beforehand.
**Frontal/cognitive involvement:**
In approximately 10–15% of ALS patients more noticeable memory problems, behavioural changes or loss of motivation also occur, pointing to frontotemporal involvement. This sometimes begins at the same time as motor symptoms, sometimes later. It makes planning and self-care even more complex.
**Respiratory onset:**
Very rarely do breathing problems begin fairly quickly at the start (primarily in the breathing muscles). This usually progresses faster than spinal or bulbar forms.
---
When to contact your doctor
Even in a recognized phase of ALS, sudden serious changes can occur that require rapid medical attention:
- **Sudden worsening of breathing:** shortness of breath that gets much worse, anxiety, no longer being able to lie down properly — this can indicate infection or rapid increase in weakness.
- **Swallowing problems that worsen quickly:** risk of choking and pneumonia.
- **Severe pain:** can point to additional problems (contractures, infection, pressure).
- **Fever, cough or flu-like symptoms:** infections progress more rapidly and severely in ALS.
- **Confusion, extreme drowsiness or unusual mood changes:** may indicate fluid accumulation, sleep deprivation or other complications.
- **Severe constipation or inability to take in water:** dangerously rapid.
Your healthcare provider helps to get clarity and determine what you want — more support, investigation, or symptom management only. These conversations are not one-time, but evolve with your illness.
---
_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._