Other symptoms include tenderness and pain over the sinuses, frontal headaches, and sometimes chills, fever, and pressure in the area of the sinuses. Chronic sinusitis differs slightly, in that symptoms can be milder and may only include postnasal drip, bad breath, and an irritating dry cough. Hay fever , environmental triggers unrelated to hay fever, food allergens , and dental infections can also lead to sinusitis. Although food allergies may also contribute to the problem, some researchers believe food allergies only rarely cause sinusitis. However, research has yet to investigate the effects of pantothenic acid supplementation in people who have sinusitis.
Histamine is associated with increased nasal and sinus congestion.
Another study found that 2,000 mg of vitamin C helped protect individuals exposed to a histamine challenge. Not every study reported reductions in histamine. Although preliminary evidence supports the use of vitamin C when injected into the sinuses of people suffering with acute sinusitis, the effect of oral vitamin C on symptoms of sinusitis has yet to be formally studied. 8 Bromelain , an enzyme derived from pineapple, has been reported to relieve symptoms of acute sinusitis. 9 Other double-blind research has shown that bromelain reduces symptoms of sinusitis.