LEMS Symptoms: Managing Dry Mouth, Vision, and GI Challenges
Health ConditionsAutoimmune Diseases

The Hidden Symptoms of LEMS: Managing Dry Mouth, Vision, and GI Issues

The Hidden Symptoms of LEMS: Managing Dry Mouth, Vision, and GI Issues
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Published on March 9, 2026
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If you’re living with Lambert-Eaton myasthenic syndrome (LEMS), you probably already know that muscle weakness is one of the most common symptoms. It may even be what sent you to the doctor in the first place. But LEMS also affects your body’s automatic nervous system, which quietly controls bodily functions such as heart rate, digestion, and more.

“The same mechanism that causes muscle weakness in LEMS is also present in the small nerves that can cause autonomic symptoms,” says Christopher Nance, MD, a neurologist with University of Iowa Health Care in Iowa City, who specializes in neuromuscular diseases. “This can cause autonomic symptoms like dryness of the mouth or skin, but they can also have GI issues and lightheadedness.”

Although these “hidden” symptoms can be just as debilitating as muscle weakness, they are often overlooked. Paying attention to all the ways LEMS affects you can help you and your doctor create a care plan that works best for you. Here’s what you should know about these lesser-known symptoms of LEMS — and how to start managing them.

How to Manage Autonomic LEMS Symptoms

The three most common autonomic symptoms with LEMS are xerostomia (dry mouth), gastrointestinal issues (namely constipation), and blurred vision. Here are some tips for dealing with each:

Dry Mouth

To combat dry mouth, Krushangi Patel, MD, a medical oncologist at City of Hope in Long Beach, California, recommends several salivary stimulants:

  • Sugar-free hard candies or lozenges
  • Sugar-free chewing gums containing various sweeteners such as aspartame, saccharin, and sorbitol, which can increase saliva production in patients with residual secretory capacity
  • Xylitol-containing gum or candy, which may also reduce the carcinogenicity of the oral bacterial flora.
  • Citrus-flavored sugarless tablets or oral drops containing malic acid
  • Dried fruit slices
  • Topically applied oral inserts (such as Xylimelts or Salese lozenges)

“Artificial saliva is another option often containing a unique mix of multiple components in each preparation, such as carboxymethylcellulose, polyethylene glycol, sorbitol, and electrolytes,” says Dr. Patel.

When these aren’t enough, Patel also recommends sialagogues — drugs that stimulate the production of saliva like pilocarpine (Salagen) or cevimeline (Evoxac).

Other important factors are dental hygiene and avoiding oral irritants (such as coffee, alcohol, and nicotine), she adds.

Gastrointestinal Issues

Since LEMS most commonly causes constipation, Patel says that simple management options include upping your fiber intake, stool softeners, and drinking more water.

Consider incorporating high-fiber foods such as apples, berries, cabbage, green leafy vegetables, and whole-wheat grains to your diet.

Motility agents (also known as prokinetic agents) can also help, says Patel. They cause muscle contractions to move food down the GI tract, and include pyridostigmine (Mestinon) and bethanechol.

Blurred Vision

Blurred vision and changes to the light reflexes of your pupils (how much they change due to the amount of light around you) also occur with LEMS.

"The light reflex changes include a sluggish response to light stimulation and more dilated pupils,” says Patel. “These are best treated with more systemic therapies rather than topical eye drops.”

Intravenous immunoglobulin (IVIG) and steroids are some of the preferred therapies to treat these issues, though newer LEMS directed systemic therapies like amifampridine are also available.

Advocating for Comprehensive LEMS Care

Comprehensive care is essential when you’re dealing with multiple conditions like LEMS and lung cancer. Successful management of both LEMS and cancer involves a team of care professionals, from your neurologist and oncologist to specialists like gastroenterologists, optometrists, and dentists. To keep your providers up to date on all aspects of your care, ask the following:

  • Do you have the contact information for my other providers? Make sure they have all the up-to-date information for your entire care team, including if you switch providers or add new specialists along the way.
  • Why am I having new symptoms? Patel says even if you already discussed new symptoms with one doctor, make sure you tell the others about these and ask what they might mean.
  • Have you consulted the rest of my team about new changes to my treatment? Whether they’re adding new medications, changing dosages, or phasing out medications, your team should know exactly what kinds of treatments you’re receiving, and if they aren’t on board with these changes, ask them to explain why.

The Takeaway

  • The hidden symptoms of LEMS are ones that affect the autonomous nervous system, including dry mouth, GI issues, and blurred vision.
  • Use sugar-free candies and gum, xylitol-containing gum and candy, artificial saliva, and sialagogues to combat dry mouth.
  • Switch to a high-fiber diet and consider stool softeners for constipation.
  • IVIG and steroids can help with vision symptoms, as can medications like amifampridine.
  • Make sure your doctors are up to date on all your symptoms and treatments to ensure the best comprehensive care.
EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
Resources
  1. Autonomic Nervous System. Cleveland Clinic. June 15, 2022.
  2. High-Fiber Foods. National Cancer Institute. October 15, 2024.
  3. Prokinetic Agents. Cleveland Clinic. April 26, 2024.
  4. Pupillary Light Reflex (PLR). Cleveland Clinic. February 6, 2026.
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Jason Paul Chua, MD, PhD

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Jason Chua, MD, PhD, is an assistant professor in the Department of Neurology and Division of Movement Disorders at Johns Hopkins School of Medicine. He received his training at the University of Michigan, where he obtained medical and graduate degrees, then completed a residency in neurology and a combined clinical/research fellowship in movement disorders and neurodegeneration.

Dr. Chua’s primary research interests are in neurodegenerative disease, with a special focus on the cellular housekeeping pathway of autophagy and its impact on disease development in diseases such as Parkinson disease. His work has been supported by multiple research training and career development grants from the National Institute of Neurological Disorders and Stroke and the American Academy of Neurology. He is the primary or coauthor of 14 peer-reviewed scientific publications and two peer-reviewed online learning modules from the American Academy of Neurology. He is also a contributing author to The Little Black Book of Neurology by Osama Zaldat, MD and Alan Lerner, MD, and has peer reviewed for the scientific journals Autophagy, eLife, and Neurobiology of Disease.

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