During acute hepatitis B, pre-icteric, icteric and convalescence periods are distinguished. The disease begins instantly. The pre-icteric period lasts 1-5 weeks. Asthenovegetative (weakness, fatigue, exhaustion) and dyspeptic (loss of appetite, decreased taste sensations, nausea, sometimes vomiting, bitterness in the mouth, heaviness and dull pain in the right hypochondrium) syndromes are characteristic.