Head ache and Unpredictable situation

Head ache noun - Pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs.

Unpredictable situation and head ache are semantically related. in complicated situation topic. In some cases you can use "Unpredictable situation" instead a noun phrase "Head ache".

Head ache and unpredictable situation are semantically related. Sometimes you can replace phrase "Head ache" with "Unpredictable situation", this phrases are similar.