Invisible illnesses are not visually recognized and many are not commonly known.
However, this doesnt make the sickness any easier to deal with.
Respect Their Limits
The person with the invisible illness is an expert of their body.

Daria Shevtsova
They know better than anyone what they can and cant do.
So, allow them to speak for themselves and set their own boundaries.
A little encouragement is good, but dont mistake their rationality for defeat.
Treat them like you would treat anyone else, and they will let you know if they need help.
Ask (Appropriate) Questions
Invisible illnesses are not visually recognized and many are not commonly known.
If you want to learn more about the persons illness to understand their situation better, just ask them!
They can try their best to schedule activities, but they may have to cancel at the last minute.
Its frustrating, but its much more frustrating to have to live with the illness itself.
Chronic fatigue and joint pain due to lupus could limit even the simplest of activities.
Dont Take It Personally
Invisible illnesses suck.
Its emotionally, physically, and mentally draining.
Dealing with an invisible illness can make it seem impossible to deal with the rest of the world.
Amidst a lupus flare, it can feel like your body is actively trying to ruin itself.
Take a step back and consider how they are feeling before assuming that they are being malicious.