痛くて

hurting, in pain (and/because it hurts)

→ 痛い
痛 painful, hurts + く Adverbial form + て Te-form (conjunctive form)
adjective Uncommon #18,853
hurting, in pain (and/because it hurts) The て-form connects this adjective to what follows, often giving a reason.
JA: 足が痛くて歩けません。
EN: My leg hurts, so I can't walk.
Forms of 痛い

歯が痛くて眠れなかった。

My tooth hurt so much that I couldn't sleep.

彼女は痛くて悲鳴を上げた。

She screamed in pain.

彼は痛くて大声を上げた。

He cried out in pain.

喉が痛くて微熱があるんです。

I have a sore throat and a slight fever.

痛くても我慢した。

I put up with it even though it hurt.

歯が痛くて痛くて。

My tooth hurts so much.

口内炎が痛くて、あまり食べられないんだ。

My canker sore hurts, so I can't eat much.

背中が痛くて死にそうだ。

My back hurts so badly I feel like I’m going to die.

口内炎ができて食事する時、痛くて痛くて。

I have a mouth ulcer, and it hurts terribly whenever I eat.

痛くて痛くて、眠れなかった。

It hurt so much that I couldn't sleep.