Yes, women can and do get ALS, though it is diagnosed in men more often

ALS affects both men and women. Roughly one in three people diagnosed with ALS is a woman, which means two in three are men. The reason for this difference is not fully understood — it is not because women are biologically protected from the disease. Women are sometimes diagnosed later than men, partly because doctors may not suspect ALS as readily in female patients, and partly because some symptoms present differently or develop at a different pace.

The disease itself works the same way in women as in men: motor neurons in the brain and spinal cord gradually break down, leading to muscle weakness, difficulty speaking or swallowing, and eventually loss of the ability to move. Women with ALS face the same progression and the same treatment options as men, though their experience of living with the disease may differ in practical ways.

Key Takeaways

  • Women make up roughly one-third of ALS diagnoses, but the disease affects the nervous system the same way regardless of sex.
  • Women may be diagnosed later than men because early symptoms are sometimes attributed to other conditions more common in women, such as thyroid disease or depression.
  • Pregnancy and hormonal changes do not cause ALS, and having ALS does not automatically prevent pregnancy, though the disease does create medical and practical challenges during pregnancy.
  • Women with ALS report different social and caregiving experiences than men, including assumptions about their role as caregivers rather than patients.
  • The same medications (riluzole and edaravone) are used to slow progression in both men and women, and clinical trials now include more women than they historically did.

Why women are diagnosed less often, even though they get ALS

The male-to-female ratio in ALS diagnosis is real, but it does not mean women are less likely to develop the disease. Instead, several factors delay diagnosis in women. Early ALS symptoms — fatigue, muscle twitching, slight weakness in the hands or legs — can resemble conditions that are more commonly diagnosed in women, such as fibromyalgia, thyroid dysfunction, or depression. A doctor may pursue those diagnoses first, which can add months or years before ALS is considered.

Women also report that their symptoms are sometimes dismissed as stress-related or attributed to menopause, particularly if they are in their 50s or 60s. Because ALS is rarer than these other conditions, it may not be the first thing a doctor thinks of when a woman describes fatigue or weakness. This is called diagnostic delay, and it means women often see multiple doctors before receiving an ALS diagnosis.

Once a diagnosis is made, the disease course in women is similar to that in men. Some research suggests women may have slightly longer survival times on average, but this varies widely from person to person and is not a reliable predictor for any individual.

ALS and pregnancy: what women need to know

ALS does not cause infertility, and women with ALS can become pregnant. However, pregnancy in someone with ALS requires careful planning and close coordination between the neurologist, obstetrician, and other specialists. The physical demands of pregnancy — weight gain, changes in posture, increased metabolic needs — can accelerate weakness in muscles already affected by ALS. Breathing may become more difficult, especially in the third trimester when the growing uterus presses upward on the diaphragm.

Medications used to treat ALS have different safety profiles in pregnancy. Riluzole has been used in pregnant women with ALS, though data are limited. Edaravone is newer, and less is known about its safety during pregnancy. A woman with ALS who is considering pregnancy should discuss these medications with her neurologist and obstetrician well before conception so they can plan which treatments to continue, pause, or adjust.

Caring for a newborn while managing ALS is physically demanding. Women with ALS who become pregnant often need to plan for additional help with childcare, household tasks, and personal care as the pregnancy progresses and after delivery. Some women choose to pause or reduce work during pregnancy; others continue working. The right choice depends on the stage of the disease, the type of work, and available support.

How hormones and sex differences affect ALS progression

Researchers have long wondered whether sex hormones influence ALS risk or progression. Some animal studies suggest that estrogen may have a protective effect on motor neurons, which could explain why men are diagnosed more often. However, this has not been proven in humans, and hormone replacement therapy is not a treatment for ALS. Menopause does not cause ALS, and ALS does not cause early menopause.

The biological differences between men and women that do matter in ALS are not yet fully mapped. Women and men may metabolize medications differently, which could affect how well riluzole or edaravone works. Women may also experience different side effects from these drugs, though individual variation is large. Research that includes both men and women is still limited, which is why neurologists cannot always predict how a specific woman will respond to treatment.

Social and caregiving differences for women with ALS

Women with ALS often encounter different social expectations than men with the disease. Because women are traditionally expected to be caregivers, a woman with ALS may face pressure to continue caregiving roles even as her own health declines. Family members or friends may not immediately recognize that she needs help, or may expect her to manage household tasks and care for others while managing her own illness. This can delay her own access to support and increase stress.

Women with ALS also report that their disease is sometimes taken less seriously by healthcare providers, family, or employers. A woman who has difficulty walking may be told to "just exercise more," while a man with the same symptom might be referred to a neurologist more quickly. These biases do not change the disease itself, but they can affect how quickly a woman receives diagnosis and treatment, and how much support she can access.

Clinical trials and research: improving data on women with ALS

Historically, ALS clinical trials enrolled far more men than women, which meant that data on how treatments work in women were limited. This is changing. Recent trials of new ALS drugs have made efforts to include more women, and researchers are now analyzing whether sex differences affect treatment response. However, the overall body of research on ALS in women remains smaller than research on ALS in men.

If you are a woman with ALS, you may be asked to participate in research or clinical trials. These studies help researchers understand whether treatments work the same way in women as in men, and whether women experience different side effects. Participation is voluntary, and you can ask questions about what the study involves before deciding whether to take part.

Frequently Asked Questions

Does having ALS mean I cannot get pregnant?

No. ALS does not cause infertility. However, pregnancy puts physical stress on the body, and that stress can worsen ALS symptoms. You should discuss pregnancy plans with your neurologist and obstetrician so they can help you manage the disease during pregnancy and prepare for the demands of caring for a newborn.

Will my daughter inherit ALS from me?

Most ALS is not inherited. About 90 percent of ALS cases are sporadic, meaning they occur randomly and are not passed down in families. If you have familial ALS (the inherited form), your children have a 50 percent chance of inheriting the genetic mutation, but inheriting the mutation does not may provide they will develop the disease. Genetic counseling can help you understand your specific situation.

Why was my ALS diagnosis delayed?

Diagnostic delay happens to both men and women, but women report it more often. Early ALS symptoms can look like other conditions, and doctors may pursue those diagnoses first. If you were told your symptoms were stress or menopause before ALS was considered, that reflects a common pattern, not a failure on your part to communicate clearly.

Are there treatments designed specifically for women with ALS?

No. The medications used to slow ALS progression — riluzole and edaravone — are the same for men and women. However, women and men may respond differently to these drugs, and research to understand those differences is ongoing. Your neurologist can discuss how these medications are expected to work in your specific case.

Can I participate in ALS research if I am a woman?

Yes. Clinical trials and research studies on ALS now actively recruit women. Researchers are working to understand whether sex differences affect how ALS develops and how treatments work. You can ask your neurologist about studies recruiting in your area, or search ClinicalTrials.gov for ALS trials near you.