אם יש לך כאב ראש, תשתי מים ותנוחי קצת.

there is

Breakdown of אם יש לך כאב ראש, תשתי מים ותנוחי קצת.

• מים: water
• לך: to you
• ו: and

Questions & Answers about אם יש לך כאב ראש, תשתי מים ותנוחי קצת.

Why does יש לך mean you have? It looks like there is to you.

That is exactly how Hebrew usually expresses possession.

• יש = there is / there are
• לך = to you (addressing one female or one male; the form is the same here)

So:

• יש לך כאב ראש = literally there is to you a headache
• Natural English: you have a headache

This is the normal Hebrew pattern for to have:

• יש לי זמן = I have time
• יש לנו שאלה = we have a question

The negative version is אין:

• אין לי זמן = I don’t have time

Why is it כאב ראש and not something that literally says pain of head with של?

Hebrew often uses a construct phrase for combinations like this, where two nouns are linked directly.

• כאב = pain
• ראש = head
• כאב ראש = headache / literally head-pain

This is more natural than using של here.

Compare:

• כאב בטן = stomachache
• בית ספר = school, literally house of book
• כוס מים = a glass of water

So כאב ראש is just the normal Hebrew way to say headache.

Who is this sentence addressed to? How can I tell?