However, unlike physical illnesses, which have visible symptoms, many people find their mental health difficult to talk about, and as such, those with depression, anxiety and other mental health problems suffer in silence, feeling increasingly isolated and alone in their struggle.
#Whatyoudontsee is the hashtag that's aiming to change all of this. These four words have inspired thousands of people living with various condition to take to social media and share their experience of mental illness, from feelings of shame and stigma to the complete and utter exhaustion of coping.
The tweets on this timeline not only let everyone else out there going through the same thing know that they're not the only one - they help those who haven't experienced the conditions understand just how tough it is, and the response has been phenomenal.
Some have spoken about about the difficulties with daily tasks like going to work...
#WhatYouDontSee is the brain fog + memory loss that make it very difficult (and embarrassing at times) to hold a conversation or do your job— Gem (@ThisMyGem) April 21, 2016
#WhatYouDontSee The absolute exhaustion after getting home from a normal day at work faking it for the outside world.— Phil Robinson (@phildrobinson) April 18, 2016
#WhatYouDontSee the lethargy and tiredness that feels like it's gotten into every molecule of your body making it just so heavy.— Sarah Le Blanc (@LadyMirtazapine) April 18, 2016
... while others have shared their experience with the side effects of medication:
#WhatYouDontSee is going through the side effects of medication - insomnia, dark thoughts, hot sweats, shaking, nausea & anxiety.— Kimberley Giles (@LittleKimmyJane) April 18, 2016
Many people tweeted stories about lesser known symptoms of mental illness, like 'laziness' and lack of productivity.
Being depressed eats my productivity. There are days when I know I can't do a thing because my brain just won't think. #WhatYouDontSee— Thea (@TheaDrogna) April 18, 2016
Isolation was also a common theme in the tweets being shared...
#WhatYouDontSee the feeling of loneliness even when surrounded by many people.— Alessandra (@alesandrana) April 20, 2016
... and the stigma surrounding depression has been addressed many times:
#WhatYouDontSee the shame that comes with having depression and anxiety. It feels almost too cliche. (I was scared to tweet this)— Julia Wilde (@Julia_SCI) April 20, 2016
You also don't see the terrible, burning shame and embarrassment that what one week was easy is the next impossible #whatyoudontsee— Mark Brown (@MarkOneinFour) April 18, 2016
While lack of positivity was an issue that was discussed repeatedly...
#WhatYouDontSee is the struggle of trying to find the positives in things and being happy when your brain literally just won't let you.— Rosie the copycat ninja. (@celestialrosie) April 21, 2016
... some have simply used the hashtag to promote kindness and understanding within the community. One user wrote, '#WhatYouDontSee is that people suffer in silence everyday. Be kind, you dont know other peoples battles. Don't assume that you do.'
#WhatYouDontSee is that people suffer in silence everyday. Be kind, you dont know other peoples battles. Don't assume that you do.— Rebecca Collins (@rubz52) April 20, 2016
'I don't think there's ever been a more beautiful, raw, honest, brave or inspiring hashtag than #WhatYouDontSee,' another added. '😘 to every single one'.
I don't think there's ever been a more beautiful, raw, honest, brave or inspiring hashtag than #WhatYouDontSee— Bitsy von Muffling (@KateOfHysteria) April 18, 2016
ðŸ˜˜ to every single one
If you're experiencing depression or any other kind of mental illness, there is support available. Visit mind.org.uk for further help and information.