The most common and most likely answer to this crossword clue is the 9 letter word MIGRAINES
I've seen this crossword clue in Independent
M
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Buddy explains!

The straight part
We know that "complaints" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case complaints = migraines.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MIGRAINES mean?
MIGRAINES noun- A severe, disabling headache, usually affecting only one side of the head, and often accompanied by nausea, vomiting, photophobia and visual disturbances.
- A neurological condition characterised by such headaches.