Infection can cause bodily tissues to swell.
Antihistamines reduce swelling in mucous membranes and soft tissues.
Antihistamines can help with certain infections.
What can help with sinus infections?

[a] arteries
[b] hydration
[c] one celled organisms
[d] prolactin release
[e] radiography
[f] Enzymes
[g] antihistamines
[h] aqueous solution