疼

Sickness radical wraps the top-left - a person leaning on a sickbed. It marks 疼 in the bodily-suffering family with 痛 pain, 病 illness, 疯 mad, 疲 weary. The radical sets the emotional register too: ache and tenderness are intertwined here, hence the second sense 'to dote on, to love deeply' (loving someone the way an ache claims attention).

Right side is 冬 'winter', supplying the sound - dōng drifting to téng with regular d/t alternation. Same phonetic core in 终 end and 咚 boom. A wintry image fits the dull, cold ache of bodily pain - the throb of 头疼 a headache, the chill of 牙疼 a toothache, the long ache of caring for someone you 疼.