He suffered from headaches and loss of appetite.

他患有头痛和食欲不振。

《牛津词典》

People under too much pressure would sometimes suffer from muscle aches, headache, tiredness, loss of appetite and so on.

压力太大的人有时候会有肌肉疼痛、头痛、疲劳、食欲不振等症状。

youdao

Side-effects: Loss of appetite and nausea occur in most cases, sometimes with vomiting.

副作用：多数病例出现食欲减退、恶心，有时呕吐。

youdao

But as she went down a list of symptoms, they were all there -- loss of appetite, trouble sleeping, waves of irrational anxiety, crying for no reason, loss of interest in work and hobbies, isolation and seclusion.

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Long-term effects of injecting heroin include collapsed veins, loss of appetite and severe constipation.

BBC: Factfile on drugs

Loss of appetite or anorexia is often associated with cachexia, especially cachexia of malignancy.

CNN: Is the inability of cancer patients to eat a concern?