Multifocal motor neuropathy

What is MMN?

Multifocal motor neuropathy (MMN) is a rare condition. Around 3,000-10,000 people in the US are thought to have MMN. In MMN, nerves that control muscles are harmed by the immune system. MMN can cause muscle weakness in the arms and legs, making it hard to function normally. This can lead to muscle weakening as the disease progresses.

MMN symptoms

Common symptoms of MMN include muscle weakness in the arms and legs. Spasms and twitching can also occur. These symptoms can begin on one side of the body and worsen.

Living with MMN

MMN can cause a range of challenges over time. That’s why many people living with MMN work with a team of specialists for diagnosis and care:


(for disorders of the central nervous system and brain)


(for disorders of the immune system)


(for disorders of the skeleton and muscles)

Physical therapists

(to strengthen muscles)

The above information is not intended to be medical advice. For medical advice, always speak with your healthcare provider.

Finding support*

GBS/CIDP Foundation International is working for a future when no one with Guillain-Barre syndrome (GBS), chronic inflammatory demyelinating polyneuropathy (CIDP), and related syndromes such as multifocal motor neuropathy (MMN) suffers alone and that everyone has access to the right diagnosis and the right treatment, right away.

Neuropathy Action Foundation (NAF) is dedicated to ensuring neuropathy patients obtain the resources, information, and tools they need to get access to treatment that may improve their quality of life.

The Foundation for Peripheral Neuropathy serves as a resource for advancing collaborative and innovative therapeutic developments and accelerating the ability to diagnose, treat, prevent, and cure peripheral neuropathy.

*The above links are provided as a resource. This is not an endorsement, and Takeda has no control over the content of any website not owned by Takeda.

Need help with out-of-pocket treatment costs?

You may be eligible for assistance.

Find out about co-pay assistance

Have questions about your eligibility? You must be enrolled in OnePath and have commercial insurance. Other terms and conditions apply. Call OnePath at 1-866-888-0660 Monday through Friday, 8:30 AM to 8:00 PM ET.

Frequently asked questions

OnePath specialists are here to help answer questions about your condition and your Takeda treatment plan. Your Patient Support Manager (PSM) can connect you with one of these specialists. Call us Monday through Friday, 8:30 AM to 8:00 PM ET, at 1-866-888-0660. You should also speak with your healthcare provider if you have specific questions about your health.