als.net Paid content

ALS (amyotrophic lateral sclerosis) is a progressive motor neuron disease that damages the nerve cells controlling voluntary muscles, leading to weakness, loss of movement, and eventually difficulty breathing. It is also known as Lou Gehrig's disease, after the baseball player diagnosed with it in 1939, and is classified as a form of motor neuron disease (MND). The ALS Therapy Development Institute (ALS TDI) describes itself as the largest drug discovery lab in the world focused solely on finding treatments for ALS — a useful starting point if you want to understand both the disease and where research currently stands.

What ALS Is and Who It Affects

ALS attacks motor neurons — the nerve cells in the brain and spinal cord that carry signals to muscles. As these neurons degenerate, muscles stop receiving signals and begin to weaken and waste away. The disease does not typically affect the senses (sight, hearing, touch, taste, smell) or, in most cases, bladder and bowel control, which distinguishes it from some other neurological conditions.

The terminology can be confusing, so it helps to separate the names:

ALS can affect adults of any age, though it most commonly appears in middle to later life. Because the disease varies in how it starts and progresses, no two people experience exactly the same path.

Early Signs and Symptoms

Symptoms usually begin subtly and may be noticed first in the hands, arms, legs, or muscles involved in speaking and swallowing. Common early signs include:

• Muscle weakness — trouble gripping objects, lifting, walking, or climbing stairs
• Muscle twitching (fasciculations) and cramping
• Muscle wasting (atrophy) in the hands, arms, or legs
• Slurred or thick speech (dysarthria)
• Difficulty swallowing (dysphagia)
• Tripping or dropping things due to weakness
• Emotional changes in some people, such as inappropriate laughing or crying (pseudobulbar affect)

Because these symptoms overlap with many other, more treatable conditions, they do not by themselves mean a person has ALS. That overlap is one reason diagnosis is not immediate.

How ALS Is Diagnosed

There is no single test that confirms ALS. Diagnosis is a clinical process: a neurologist evaluates symptoms, examines motor and sensory function, and rules out conditions that mimic ALS — such as certain nerve disorders, spinal cord problems, and other motor neuron diseases.

The process typically involves:

1. Medical history and neurological exam — assessing weakness, reflexes, muscle tone, and coordination
2. Electromyography (EMG) — measuring electrical activity in muscles to detect motor neuron damage
3. Nerve conduction studies — checking how well nerves carry signals
4. MRI and other imaging — looking for structural causes of symptoms
5. Blood and other lab tests — excluding treatable conditions with similar symptoms

Because ALS is diagnosed by exclusion, confirming it can take time. Symptoms may need to be observed and monitored before a neurologist is confident in the diagnosis. This delay is common and does not necessarily indicate uncertainty about the eventual conclusion.

Current Treatment Approaches

There is currently no cure for ALS, and treatment focuses on slowing progression where possible, managing symptoms, and maintaining quality of life. What treatment can and cannot do is important to understand:

• Can slow the rate of decline in some people, depending on the specific therapy and the individual
• Can relieve symptoms such as muscle cramps, spasticity, excess saliva, and breathing difficulty
• Can support nutrition, communication, and mobility through assistive devices and therapies
• Cannot reverse existing motor neuron damage or restore lost muscle function
• Cannot stop progression entirely in most cases

Care is typically delivered by a multidisciplinary team — neurologists, physical and occupational therapists, speech-language pathologists, respiratory specialists, dietitians, and social workers — because ALS affects many body systems over time. A neurologist is the right person to discuss which specific treatments are appropriate for an individual, as options and eligibility vary.

Where to Find Credible Research Updates and Support

Because ALS research moves quickly, reliable updates matter. The ALS Therapy Development Institute (als.net) is one source focused specifically on ALS drug discovery, and it offers a way to receive updates through its subscribe page. Other credible resources include academic medical centers with ALS clinics, national ALS associations, and patient registries that connect people to research studies.

When evaluating any ALS information, look for:

• Named medical or research institutions behind the content
• Clear distinction between approved treatments and experimental research
• Dates on research updates, since findings evolve
• Contact routes to ALS clinics or specialists for personal medical questions

For anyone newly researching ALS — whether for themselves or a family member — the practical next step is usually to consult a neurologist experienced with motor neuron disease, while using research organizations like ALS TDI to stay informed about the science as it develops.

Lou Gehrig disease is another name for ALS (amyotrophic lateral sclerosis), the progressive motor neuron disease that weakens muscles and affects movement, speech, swallowing, and eventually breathing. The name became widely used in the United States after baseball player Lou Gehrig was diagnosed in 1939, and it remains a common alias today. ALS is the modern clinical term; "Lou Gehrig disease" is the popular American name for the same condition.

Who Lou Gehrig Was and Why the Name Stuck

Lou Gehrig was a star first baseman for the New York Yankees, known for his durability and consecutive-games streak. When he was diagnosed with ALS in 1939, the disease was still relatively unfamiliar to the general public. His fame, his public farewell, and the attention his illness received helped attach his name to the condition in the United States.

That is the core reason the alias exists: a well-known public figure became the face of a disease that most people had never heard of. The association was strong enough that "Lou Gehrig disease" entered common usage, even though the clinical name remained ALS.

ALS, Lou Gehrig Disease, and Other Names

These terms describe the same disease but come from different contexts:

The differences are largely about language, region, and history rather than about distinct conditions. If you see any of these names, the underlying disease being discussed is generally the same.

Why the Distinction Matters

Knowing that Lou Gehrig disease and ALS are the same thing helps in two practical ways:

• Searching for information. Reliable resources may use either term. If you only search one name, you may miss useful material.
• Talking with clinicians. Medical professionals typically use "ALS" or "motor neuron disease." Using the clinical term can make conversations and record-keeping clearer.

The ALS Therapy Development Institute (ALS TDI) describes itself as the largest drug discovery lab focused solely on finding treatments for ALS, and it uses "ALS" alongside related terms including Lou Gehrig disease and motor neuron disease.

Where to Go Next

If you want to understand the disease itself—symptoms, how it is diagnosed, and what treatment options exist—start with a general explainer on ALS rather than the name history. The naming question is settled: Lou Gehrig disease is ALS. The more useful next step is learning how the disease progresses, how it is evaluated, and what research is underway.

Motor neuron disease (MND) is an umbrella term for a group of progressive conditions that damage motor neurons—the nerve cells in the brain and spinal cord that control voluntary muscle movement. ALS (amyotrophic lateral sclerosis) is the most common and most widely known form of MND, which is why the two terms are often used interchangeably, especially in the United States. In the UK and much of Europe, "motor neuron disease" is the preferred clinical term, while "ALS" dominates in the US. If you or someone you know has received either label, the practical next step is the same: confirm which specific MND subtype is involved, because that determines prognosis, symptom pattern, and treatment options.

What Motor Neuron Disease Actually Means

MND describes the underlying problem—degeneration of motor neurons—rather than a single disease. Motor neurons come in two main types:

• Upper motor neurons (UMNs) travel from the brain's motor cortex down to the spinal cord.
• Lower motor neurons (LMNs) travel from the spinal cord or brainstem out to the muscles.

Different MND subtypes affect these neurons differently, which produces different symptom patterns and rates of progression.

The main types of MND

This table is a general map, not a diagnostic tool. Subtype classification requires clinical evaluation, and some cases shift category over time.

How ALS Fits Under the MND Umbrella

ALS sits inside MND as its most common subtype. The confusion between the two terms is largely geographic and historical:

• In the US, "ALS" is the default term, partly due to the legacy of Lou Gehrig's diagnosis and the prominence of US-based advocacy and research organizations.
• In the UK and Europe, "motor neuron disease" is the standard clinical label, and ALS is treated as one type within it.
• "Lou Gehrig's disease" and "Charcot's disease" are older or eponymous names for ALS specifically.

So when someone says "MND," they may mean the whole category or, in British usage, ALS specifically. Context usually clarifies it, but it's worth confirming in any medical conversation.

Symptoms by Body Region

MND symptoms depend on which motor neurons are affected and where degeneration starts. Onset varies widely between individuals.

Limb onset

• Weakness or clumsiness in hands, arms, legs, or feet
• Tripping, dropping objects, difficulty with fine motor tasks
• Muscle twitching (fasciculations), cramps, or stiffness

Bulbar onset

• Slurred or slowed speech
• Difficulty swallowing (dysphagia)
• Excessive saliva or choking episodes
• Emotional lability (uncontrolled laughing or crying) in some cases

Respiratory onset

• Shortness of breath, especially when lying flat
• Weak cough
• Morning headaches or daytime fatigue from poor sleep

Progression is typically gradual and asymmetric—one side or one region often leads. Sensory function, bowel and bladder control, and eye movements are usually preserved in ALS, which helps distinguish it from some mimics.

How MND Is Diagnosed

There is no single definitive blood test for ALS or most MND subtypes. Diagnosis is clinical, supported by testing that rules out other conditions.

1. Neurological exam — assesses reflexes, muscle tone, strength, and signs of UMN versus LMN involvement.
2. Electromyography (EMG) — measures electrical activity in muscles and can detect LMN damage; often paired with nerve conduction studies.
3. MRI — images the brain and spinal cord to exclude tumors, strokes, structural compression, or other causes.
4. Blood and urine tests — screen for treatable mimics such as vitamin deficiencies, thyroid disorders, or heavy metal exposure.
5. Genetic testing — relevant when inherited forms (like SMA or familial ALS) are suspected.

Because MND mimics other conditions, diagnosis often involves ruling out alternatives before confirming. Some people receive a diagnosis only after symptoms have progressed enough to meet established criteria.

Treatment and Care Approaches

Current treatment focuses on slowing progression where possible and managing symptoms to maintain quality of life. There is no cure for ALS or most MND subtypes as of the available information.

FDA-approved ALS drugs

Several drugs have received FDA approval for ALS. Because approvals and indications change, check the ALS Therapy Development Institute (als.net) or your clinician for the current list and eligibility.

Symptom management

• Muscle stiffness and cramps — medications, physical therapy, stretching
• Speech and swallowing — speech therapy, communication devices, dietary adjustments
• Breathing support — non-invasive ventilation (BiPAP) and, in some cases, invasive ventilation
• Nutrition — feeding tubes when swallowing becomes unsafe
• Emotional and cognitive support — counseling, and for some, treatment of frontotemporal symptoms

Multidisciplinary care

ALS clinics typically coordinate neurology, pulmonology, speech therapy, physical and occupational therapy, nutrition, and social work. This team-based model is associated with better outcomes and is the standard of care at major centers.

Where to Find Research Updates and Support

The ALS Therapy Development Institute (als.net) is a nonprofit drug discovery lab focused solely on ALS treatments. Its site offers research updates, trial information, and ways to get involved. You can subscribe for updates through their signup page.

Other resources include:

• ALS Association and Muscular Dystrophy Association for patient support and care coordination
• ClinicalTrials.gov for currently recruiting trials
• Patient registries (such as the National ALS Registry in the US) for research participation

For anyone navigating an MND diagnosis, the most useful first steps are confirming the specific subtype, connecting with a multidisciplinary ALS or MND clinic, and checking current treatment and trial options through a research-focused organization like ALS TDI.