# ALS (amyotrophic lateral sclerosis)
What is it
Amyotrophic lateral sclerosis, abbreviated ALS, is a condition in which certain nerve cells in the body gradually die. These nerve cells — called motor neurons — send signals from your brain to your muscles. They enable you to move your body.
In ALS, two groups of motor neurons are affected. The upper motor neurons are located in the brain, the lower ones in the spinal cord and nerves. As these cells become damaged, muscles can no longer receive signals and become weaker. This ultimately leads to loss of movement in different parts of the body.
ALS is a progressive disease, meaning it worsens over time. It is also a serious condition that eventually brings life-limiting consequences. Currently, there is no cure for ALS, but there are treatments that can slow its course and relieve symptoms.
ALS is also known as motor neuron disease (MND). Approximately 1 in 100,000 people develops ALS. Most people develop it between 40 and 70 years of age, but it can occur at any age.
Causes
In most cases (approximately 90%), it is unclear why someone develops ALS. This is called sporadic ALS.
In about 10% of people, ALS runs in the family. This is called hereditary or familial ALS. Certain genetic mutations, such as in the C9orf72 gene or the SOD1 gene, can cause ALS. If a parent has hereditary ALS, there is a chance for children to inherit the genetic change.
Researchers are constantly working to understand what causes ALS. Multiple factors appear to play a role:
- Accumulation of abnormal proteins in nerve cells
- Problems with how nerve cells use energy
- Inflammatory processes in the nervous system
- Possible genetic susceptibility in combination with environmental factors
However, the exact cause has not yet been fully clarified.
How the disease progresses
ALS usually starts on one side of the body or in one body part. From there, the weakness spreads to other muscle groups. The disease progresses at different speeds — in some people it goes quickly, in others more slowly.
The motor neurons gradually die. This process can span months to years. As more nerve cells die, muscles can no longer respond to signals from the brain. The muscles become smaller (called atrophy) and no longer function properly.
ALS typically affects only the motor neurons. Usually you retain your sense of touch, hearing, sight, taste and smell. Your mental abilities usually remain unaffected as well, although in a small proportion of people with ALS thinking ability also gradually declines.
The disease progresses through different body areas. Many people begin to notice that an arm or leg becomes weaker. Others notice problems with speech or swallowing first. As time passes, more muscle groups can be affected, eventually including the muscles needed for breathing.
Symptoms by phase
**Early phase (first months to year)**
In the beginning, symptoms are often subtle and can be easily overlooked. Many people feel:
- Weakness in one arm, leg or hand
- Difficulty with certain movements, such as writing or buttoning
- Slight speech or changed voice quality
- Fatigue in certain muscles
- Sometimes involuntary muscle twitches (fasciculations)
**Middle phase (months to years)**
The weakness spreads to more body parts. This can mean:
- Increasing weakness in limbs
- Difficulty walking or climbing stairs
- Further deteriorated speech
- Difficulty swallowing (dysphagia), sometimes with increased risk of choking
- More exhaustion
- Possible difficulty with certain facial expressions
**Later stage**
In this phase, many muscles are severely weakened or paralyzed:
- Significant limitation in movement
- Possible dependence on assistive devices or care
- Significant speech difficulties, sometimes no longer understandable speech
- Clear swallowing and chewing difficulties
- Difficulty breathing, especially during exertion or lying down
- Increased risk of pneumonia due to swallowing problems
It is important to emphasize that ALS does not manifest identically in everyone. Some people have primarily problems with limbs (limb-onset ALS), while others mainly have difficulties with speaking and swallowing (bulbar ALS).
What it means for daily life
ALS has significant consequences for daily activities, depending on which muscles are affected and how severe.
**Mobility and Independence**
As the disease progresses, simple tasks can become more difficult: writing your name, lifting a cup, climbing stairs or even getting up from a chair. Many people eventually have to adapt: use aids, modify the home environment or accept help from others.
**Communication**
Speech problems can be very distressing. Expressing your thoughts becomes more difficult as your voice changes. This can lead to isolation. There are all sorts of aids available — from speech amplifiers to computers that speak words as you type them — but you have to learn to use them.
**Eating and drinking**
As swallowing becomes more difficult, you need to adjust your diet. Less solid food, more targeted recipes. Sometimes a feeding tube is needed. This requires a change in habits and can feel like the loss of something normal.
**Work and society**
Many people with ALS have to stop working. This has financial consequences and can bring feelings of loss of identity.
**Emotional and relational impact**
The disease affects not only your body, but also your emotions and relationships. You grieve the loss of independence, you worry about the future. Relationships change — you become more dependent on others. This can mean an enormous emotional burden.
**Care and support**
Most people eventually need care. This can happen at home, with help from family or professional caregivers, or in a care facility. This requires a lot of coordination, and caregivers (informal carers) are regularly heavily burdened.
Outlook
ALS is a condition that ultimately results in life limitation. The average survival after diagnosis is approximately two to five years, although many people live longer, and some considerably longer. It is important to understand that this average says nothing about your personal prognosis — many factors determine how quickly the disease progresses in you.
Factors that can influence the course include:
- The age at which you are diagnosed (younger people sometimes do slightly better)
- Which part of the body is affected first (certain patterns sometimes progress more slowly)
- How quickly symptoms initially spread
- Your general health
**Current treatments**
There are a few medications available that can slow the course of ALS somewhat:
- Riluzole, one of the most commonly used drugs, can slow the disease by several months
- Other drugs can help relieve symptoms
Additionally, much research is being done into new therapies. Scientists are studying, for example, how certain inflammatory processes can be influenced, how abnormal proteins can be broken down, and new ways to protect motor neurons.
**Supportive care**
Although there is no cure, much can be done to keep you comfortable and maintain your quality of life as high as possible. This includes:
- Physiotherapy to keep muscles flexible
- Occupational therapy to adapt the home
- Speech therapy for speech and swallowing problems
- Psychological support
- Palliative care focused on comfort and dignity
Many people with ALS say that they and their loved ones find much support in oncology care teams, peer support groups and specialized ALS clinics.
Frequently asked questions
**Can I prevent ALS if it runs in my family?**
If hereditary ALS runs in your family, it doesn't automatically mean you will get it. A genetic test can provide clarity. There is no proven way to completely prevent ALS, but a healthy lifestyle (exercising regularly, eating well, staying mentally active) contributes to overall nerve health. Always discuss your concerns with a doctor.
**Will I become completely paralyzed?**
In many people with ALS, muscles eventually stop being used because the connection with nerve cells is broken. This doesn't always mean total paralysis — people can sometimes still feel something or want to move, but their body no longer responds. This is person-dependent. Many people maintain more function for longer than they expect.
**What happens to my thinking ability?**
In most people with ALS, thinking ability is preserved. You can think clearly, your memory, reasoning, and personality remain intact. Only a small part of ALS patients experience gradual cognitive change. This is something your neurologist can discuss with you based on your situation.
**Are there tests that can help detect ALS faster?**
Doctors usually use clinical examinations (muscle strength tests), electromyography (EMG, a test of nerve activity), and sometimes imaging. Research is being conducted into better biomarkers that could detect ALS faster, but these are not yet routinely available. Early diagnosis does help to seek help more quickly.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._