What is the best word for pain and health problems caused by a disease?

I want to use it as term for a collection of symptoms, that I gather.
For example: [headache, stomachache, nausea]
but without a diagnosis which disease caused it

In German I use the word Beschwerden for this. I checked different online translators, which gave these options:

discomfort, afflictions, ailment, disorders, complaints and trouble.

But I think complaints is mainly used when someone is disagreeing with something, right?

By the way, when should I use the plural form?

UPDATE:
I found these dictionary entries:
http://search.medicinenet.com/search/search_results/default.aspx?Searchwhat=1&query=complaints&I1=Search
http://dictionary.reference.com/browse/complaints?s=ts
http://www.merriam-webster.com/medlineplus/complaint
http://www.medilexicon.com/medicaldictionary.php?t=19380

Does this mean I can still use complaints?