ESA for Myasthenia Gravis: How to Describe Your Limitations on the WCA
Updated June 2026 - Based on current WCA descriptor framework
Myasthenia gravis is an autoimmune condition in which antibodies block the signal between nerve and muscle, so muscles tire and weaken the more they are used and recover with rest. The hallmark is fatigability: strength that is reasonable first thing in the morning, or after a break, drains away as the day goes on or as a movement is repeated. Common features include drooping eyelids, double vision, slurred or nasal speech, difficulty chewing and swallowing, and weakness in the arms, legs and neck that is worst in the evening. In severe flares, the muscles used for breathing can be affected, which is a medical emergency. This pattern of weakness that comes and goes with effort is exactly why the work capability rules on reliability matter so much for this condition.
The Work Capability Assessment (WCA) does not ask "do you have myasthenia gravis?" - it asks how your condition affects your ability to perform 17 specific work-related activities. To score enough points for Limited Capability for Work (LCW), you need 15 points across all 17 activities combined. For the Support Group (LCWRA on Universal Credit), you need to meet at least one Support Group descriptor, score 15 on a single activity, or qualify under the substantial-risk rule. If the threshold is unfamiliar, our guide to what Limited Capability for Work means explains it plainly.
Which WCA Activities Does Myasthenia Gravis Affect?
Because myasthenia gravis can affect almost any voluntary muscle, it can touch a wide range of the 17 activities. Which ones apply depends on whether your weakness is mainly in the eyes and face, or more generalised. The key ones to focus on are:
- Mobilising - Walking over 50 and 200 metres, where leg and hip weakness builds with each step and forces you to stop. See WCA activity 1, mobilising.
- Standing and sitting - Staying upright at a workstation as truncal and neck muscles tire through the day. See WCA activity 2.
- Reaching - Raising and holding an arm up; in myasthenia the arm may lift once then drop as the muscle fatigues. See WCA activity 3.
- Manual dexterity - Sustained fine hand use, where the hand works briefly then weakens. See WCA activity 5.
- Speaking and communication - Speech can become slurred or nasal as the day goes on, which feeds into the communication activities.
Remember, points from ALL activities are added together, and physical and mental descriptors combine. If double vision and slurred speech in the evening sit alongside leg weakness on walking, those points add up towards the 15 you need.
Mapping Myasthenia Gravis to the Descriptors
Each activity is scored on what you can sustain, not on a one-off effort. In mobilising, the test is whether you can repeatedly move 50 or 200 metres; for many people with myasthenia the first 50 metres are manageable but the legs give out on a second attempt. In reaching, the descriptor about raising an arm is decisive, because lifting an arm to shoulder or head height once is very different from holding it there or doing it repeatedly, which fatigable muscles cannot manage. In manual dexterity, what matters is whether the hand keeps working through a task, not whether it can press a single button.
The communication activities can also score where speech and swallowing are affected. If your voice fades, slurs or becomes nasal after a few minutes of talking, that is relevant to whether you can convey messages reliably across a working day. Throughout, the assessment is built on the idea that managing something briefly on a good moment is not the same as being able to work, and that is the framing your form should use. Our overview of the WCA descriptors sets out all 17 activities in detail.
Good Days, Bad Days and the Reliability Test
Myasthenia gravis fluctuates more sharply than almost any other condition the WCA assesses. Strength changes hour by hour, falls away with use, and can be knocked off course by heat, infection, stress or simply doing too much. This makes the reliability test the heart of your claim.
To be counted as able to do an activity, the law says you must be able to do it reliably, repeatedly, safely and within a reasonable time, for the majority of the time. For myasthenia gravis, two words do the heavy lifting:
- Repeatedly - this is the key word for a fatigable condition. You might lift an arm, climb a step or speak a sentence once, but the second and third attempt fail. If a job would need the action again and again, and you cannot deliver it, you should be scored as unable to do it.
- Reliably - to an acceptable standard for the majority of the time, not just in the morning window when your medication is working and you are rested.
- Safely - double vision, drooping eyelids and sudden weakness create real risks, and any chance of a breathing or swallowing crisis is a serious safety issue.
- Within a reasonable time - tasks that you can only do very slowly, with frequent pauses to recover, do not count as done within a reasonable time.
How to Describe Myasthenia Gravis on the ESA50/UC50 Form
The biggest mistake claimants with myasthenia gravis make is describing the condition in medical terms rather than work-related terms, and answering as if their best morning is their normal state. The WCA does not care about your antibody type - it cares about what you cannot do reliably, repeatedly and safely in a workplace context.
When completing your ESA50 form (or the UC50 if you are on Universal Credit), describe the fatigable pattern explicitly. Instead of "I have myasthenia gravis", write "I can lift my arm to a shelf once, but by the third time my arm will not rise and I have to stop." Instead of "my eyes are affected", write "by lunchtime my eyelids droop and I see double, so I cannot read a screen or judge steps safely." Always tie it to repetition and to the time of day.
For each activity, describe your worst typical day and the pattern through the day - strong in the morning, fading by afternoon, exhausted by evening. Think about an eight-hour working day, five days a week, and ask whether you could sustain the activity that whole time, not just at your best moment.
How much could your ESA be worth?
The amount depends on whether you reach the 15-point threshold for Limited Capability for Work, and whether you qualify for the Support Group (LCWRA). As a rough starting point, enter your main condition below to see the kind of figure a successful claim can reach. It is only an estimate - your real award depends on how the Work Capability Assessment scores your difficulties across the 17 activities.
What could your ESA be worth?
For the official figures, see our free WCA points calculator and what ESA is and how much it pays.
Support Group (LCWRA) for Myasthenia Gravis
The Support Group, called LCWRA in Universal Credit, is the higher tier. It recognises that you are not expected to prepare for work at all, and it pays more. It is reached in three separate ways, and you only need one of them:
- A Schedule 3 descriptor. Relevant descriptors for myasthenia gravis include being unable to mobilise 50 metres reliably and repeatedly, having no functional manual dexterity, or being unable to convey a simple message because of speech difficulty. The fatigable, end-of-day picture is what you need to evidence.
- Scoring 15 points on a single activity. If your weakness in one activity, such as mobilising or reaching, reaches the top descriptor when judged on a repeated basis, that single activity can place you in the Support Group.
- The substantial-risk rule. If being found capable of work, or being made to do work-related activity, would put your physical or mental health at substantial risk - for instance because exertion, heat or stress could trigger a relapse or a myasthenic crisis affecting breathing and swallowing - you can be placed in the Support Group under this rule. Our guide to the substantial-risk regulation explains how to argue it, and it is often the strongest route for this condition.
For a full walkthrough of all three routes, read our guide on how to qualify for the Support Group.
Evidence to Support Your Claim
Strong evidence is crucial for a successful WCA. For myasthenia gravis, gather:
- Letters from your neurologist or neuromuscular clinic confirming the diagnosis and describing the fatigable pattern
- Antibody test results, and records of any thymectomy or thymoma
- Records of hospital admissions, especially for a myasthenic crisis or breathing problems
- Medication details, including timing and how strength changes between doses
- Fit notes or med3 certificates
- A personal diary showing how weakness builds through the day and recovers with rest, and what you can and cannot repeat
Ask your neurologist to describe how use brings on the weakness and the functional impact on repeated tasks - not just to confirm the diagnosis. Our template for an ESA medical evidence letter shows what to request.
Get your WCA50 form wording right
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Try one activity free →Tips for Your WCA with Myasthenia Gravis
- Always describe limitations in work-related terms, and never answer based on your best morning
- Put the word "repeatedly" at the centre - explain how a task done once cannot be done a second or third time
- Describe the time-of-day pattern: stronger early, fading by afternoon, exhausted by evening
- Mention double vision, drooping eyelids, slurred speech and any swallowing or breathing problems
- Note the safety risks, including falls, choking and the possibility of a crisis
- Get supporting evidence from your neurologist that describes the fatigable pattern and repeated-task impact
If you are anxious about the assessment itself, our guide on what to say at your WCA assessment explains how to avoid underplaying a fluctuating condition when an assessor only sees you for a short time.
What if You're Rejected?
If you score too few points or are placed in the wrong group, you should challenge the decision. The first step is a Mandatory Reconsideration, where the DWP looks at your case again. If that is unsuccessful, you can appeal to an independent First-tier Tribunal. With a fluctuating, fatigable condition the most common reason for failure is being assessed on a single good attempt, so spelling out the repeatedly and reliability test is often what turns a refusal around.
Read our guides on ESA mandatory reconsideration and the ESA tribunal process for step-by-step instructions.
Official sources
This guide reflects the official Work Capability Assessment rules. For the source material, see:
- GOV.UK - Employment and Support Allowance
- GOV.UK - Health conditions, disability and Universal Credit
- The Employment and Support Allowance Regulations 2013 (Schedule 2 - WCA descriptors)
- Citizens Advice - Employment and Support Allowance
Guidance only, not legal advice. Rules can change - always check GOV.UK for the latest.
Frequently Asked Questions
Can you get ESA for myasthenia gravis?
Yes, you can claim ESA or Universal Credit on the grounds of myasthenia gravis, but the diagnosis alone does not trigger an automatic award. The Work Capability Assessment looks at how fatigable muscle weakness affects your ability to carry out 17 work-related activities. Because the weakness worsens with use and recovers with rest, a successful claim depends on showing that you cannot do tasks repeatedly or reliably across a working day, especially later in the day.
How many WCA points can myasthenia gravis score?
Myasthenia gravis can score across mobilising, standing and sitting, manual dexterity, reaching, communication and understanding communication, depending on which muscles are affected. You need 15 points in total across all 17 activities to be found to have Limited Capability for Work, and physical and mental points are added together. Only the single highest-scoring descriptor in each activity counts, and the repeatedly part of the reliability test is often decisive.
How do I qualify for the Support Group with myasthenia gravis?
The Support Group (LCWRA in Universal Credit) is separate from the 15-point test. You can reach it by meeting a Schedule 3 descriptor, by scoring 15 points on a single activity, or through the substantial-risk rule if work or work-related activity would put your health at substantial risk, for example by triggering a relapse or breathing crisis. A neurologist letter explaining how use brings on weakness, and how a crisis can affect breathing and swallowing, carries real weight.
How should I describe fatigable weakness on the ESA50 form?
Describe what happens when you keep using a muscle, not just the diagnosis. Explain that you may start a task normally but the muscle fails after a few minutes or repetitions, that your eyelids droop and your vision doubles as the day goes on, and that speech and swallowing weaken in the evening. Frame it around an eight-hour day, five days a week, and make clear how few times you can repeat an action before it stops working.
What does the reliability and repeatedly test mean for myasthenia gravis?
To count as able to do an activity, you must be able to do it reliably, repeatedly, safely and within a reasonable time, for the majority of the time. Myasthenia gravis is the textbook example of why repeatedly matters: you might lift an arm once but not a second or third time, or speak clearly for a minute then become slurred. If repeating a task makes it impossible, the law says you cannot do it, even if a single attempt looked fine to an assessor.
What evidence helps a myasthenia gravis ESA claim?
Useful evidence includes neurology and neuromuscular clinic letters, antibody test results, records of any thymectomy or hospital admissions for a myasthenic crisis, medication and timing details, fit notes, and a personal diary showing how weakness builds through the day and varies with rest. Ask your neurologist to describe the fatigable pattern and the functional impact on repeated tasks, not just to confirm the diagnosis.
What if my ESA claim for myasthenia gravis is refused?
If you score too few points or are placed in the wrong group, you can challenge the decision by asking for a Mandatory Reconsideration, and then appealing to an independent First-tier Tribunal if it is still refused. With a fluctuating, fatigable condition the most common reason for failure is being assessed on a single good attempt, so a reconsideration that spells out the repeatedly and reliability test is often where a weak first decision is overturned.