Chinese · Pronunciation Guide
toe with a strong puff of air, climbing from mid to high. The vowel starts less rounded than English "toe".
tóu
No context alters this climb. The word appears at the end of a great many compounds — 木头, 石头, 里头 — where it is usually reduced to a toneless suffix, so the same syllable is a full second tone standing alone and weightless as a suffix. Which one you need depends on the word, not on a rule.
Listen: 头
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我头疼。
Wǒ tóu téng.
My head hurts.
Listen: 我头疼。
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我头疼。 is three syllables and covers three tones: wǒ dips, tóu climbs, téng climbs again. Wǒ keeps its full descent because tóu rises. The two consecutive rises need separate downward resets — and since both syllables are about the same complaint, running them together is especially tempting.
Under-aspirating gives dōu, a very common word. Push the air out. The vowel gets fully rounded from the start, giving English "toe", when it should begin more open. And the double rise in the example sentence collapses into one plateau unless you deliberately drop the pitch between tóu and téng.