Work, fatigue and asking for support

This page is information, not legal advice

Employment rights and workplace adjustments can be complex, and this page is educational - not legal advice. If you need specific guidance about your situation, a Citizens Advice Bureau, ACAS, or an employment solicitor is the right place to go. Links are at the bottom of this page.

When thyroid conditions affect your ability to work

Fatigue, brain fog, temperature sensitivity, mood changes, and variable energy levels can all affect work - particularly in roles that require sustained concentration, regular attendance, or physical stamina. This is true even when blood tests are within the reference range, and even when colleagues or managers can't see anything wrong.

The challenge is that thyroid disease is largely invisible. You may be managing significant symptoms while appearing, to an observer, to be functioning normally.

Fit notes

If you are unwell enough to need time off work, your GP can issue a fit note (sometimes still called a sick note). Fit notes can either state that you are "not fit for work" or "may be fit for work" with specified adjustments - such as reduced hours, lighter duties, or a phased return.

A fit note covering a thyroid condition is a straightforward medical document. You should not feel embarrassed to ask your GP for one if your symptoms are affecting your ability to work. Thyroid conditions are not minor inconveniences - they can have a significant impact, and that is what fit notes are for.

Reasonable adjustments

Under the Equality Act 2010, employers have a legal duty to make reasonable adjustments for employees with disabilities. Whether a thyroid condition counts as a disability in legal terms depends on how it affects you - specifically whether it has a substantial and long-term adverse effect on your ability to carry out normal day-to-day activities (in this context, "long-term" means 12 months or more).

This is not something we can determine on your behalf - it depends on your specific situation. But if your thyroid condition has been significantly affecting your daily life for 12 months or more, it may well qualify. Adjustments that people in similar situations have asked for include:

• flexible start and finish times (to allow for fatigue or medical appointments)
• a phased return to work after time off
• remote or hybrid working where concentration is an issue
• reduced hours on a temporary basis
• a quieter working environment
• more frequent breaks

The word "reasonable" matters - what's reasonable depends on the employer, the role, and the impact. ACAS has clear guidance on this, linked below.

How to start the conversation at work

Disclosing a health condition to an employer can feel daunting. You are not obligated to share your diagnosis. You can describe the impact rather than the condition: "I'm dealing with a health condition that affects my energy and concentration, and I'd like to explore whether any adjustments could help."

If you have HR, an occupational health service, or a union representative, they can be helpful intermediaries. A referral to occupational health can sometimes result in concrete recommendations to your employer that carry more weight than a self-referral conversation.

The templates tool on this site can help you draft a note or letter to your employer if you're not sure where to start.

Attending medical appointments

Thyroid conditions often require regular blood tests and GP or hospital appointments during working hours. Many employers will accommodate this under a reasonable adjustments framework, or simply as a goodwill basis. If your employer is making attendance at appointments difficult, your GP or specialist can sometimes provide a letter confirming the medical necessity of regular appointments.

If you're not coping and work feels impossible

Some people go through periods where work simply isn't possible - and that is not a failure. Rest is part of recovery, and there is support available:

• Your GP is the first point of contact for fit notes and referrals.
• Free support lines are available if you're finding things overwhelming - not just for crisis, but for when things feel too much.
• Mind has practical guidance on mental health at work.
• ACAS has free information on employment rights and adjustments.
• Citizens Advice can help if you are facing more serious employment difficulties.

Questions to raise with your GP or specialist

• "Can you provide a fit note to cover my time off?"
• "Would you be able to write a letter for my employer explaining my condition and its impact?"
• "Is there anything in my treatment plan that might help me manage work more consistently?"

You can use the questions tool to prepare these before your appointment.