Look at these sentences with aller:
Comment va Paul? - Il ne va pas très bien ces jours-ci.How is Paul? - He's not feeling very well these days.
Comment ça va? - Ça va bien, et toi?How are you / How do you feel? - I'm fine/I feel fine, and you?
Comment vont tes enfants? - Ils vont mieux, merciHow are your children? - They feel better, thank you
In French, you can use the verb aller (to go) to make general statements about how you feel/are.
You can use it to express to feel/be fine, bad, better.
When you want to express specific statements with adjectives - I am sick/ tired/happy - you cannot use aller.
You'll use être (to be) instead:
Comment vas-tu, Bertrand ? - Je suis malade aujourd'hui.How are you, Bertrand? - I'm sick today. Comment ça va Samantha ? - Je suis fatiguée.How are you Samantha? - I'm tired.
See also Using 'sentir bon' and 'se sentir bien'
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