Baby crying on and off for hours

♡ 𝓚𝓪𝓽𝓻𝓲𝓷𝓪 𝓵𝓸𝓾𝓲𝓼𝓮 ♡

My son is nearly 6 months old and started teething ages ago. He never normally cries but recently he has more bad days than usual where he cries and cries on and off for a few hours solid!! I've changed him, fed him, given him meds for his teething, taken him for a walk, rocked him to try to sleep and nothing works

Why is this ???