We report a case of a 74-year-old male with hyponatremia complicated with small cell lung cancer. His hyponatremia worsened even with water restriction. Oral administration of sodium was difficult because of nausea and vomiting. We recognized this patient as having illness caused by excessive water accumulation within the body, and so prescribed goreisan 7.5 g/day to treat his hyponatremia. His hyponatremia improved after the administration of goreisan. Later his hyponatremia deteriorated while being administered of meloxicam, a cyclooxygenase-2 inhibitor. This case suggests that goreisan might inhibit water reabsorption by antidiuretic hormone at the collecting duct of the kidneys via stimulation of prostaglandin synthesis.

We report five cases of acute hyperventilation attack, with bilateral fullness of the chest and hypochondrium, and bilateral rectus abdominis muscle strain, that were successfully treated with shigyakusan. Case 1 was a 47-year-old female ; case 2 was an 18-year-old female ; case 3 was a 23-year-old female ; case 4 was a 39-year-old male ; and case 5 was a 40-year-old male. All five patients visited the emergency department with complaints of severe dyspnea and tetany. Their abdominal signs were characteristic, with remarkable bilateral fullness of the chest and hypochondrium and bilateral rectus abdominis muscle strain. In cases 1 to 4, the patients were given 2.5 g of shigyakusan extract, and their symptoms promptly improved. In case 5, as the patient could not swallow the prescribed medication at presentation, intramuscular diazepam was given. Thereafter, he complained of continuous severe numbness ; we subsequently gave him shigyakusan, and his numbness promptly improved. In conclusion, shigyakusan seems to be a useful Kampo drug for the treatment of acute hyperventilation attack.

A24-year-old woman felt sore throat on day 1 of symptom onset and became feverish and had chills on day 2.She came to our clinic on day 3, and was diagnosed as having a cold. Subsequently, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) gene was detected in her nasopharyngeal swab by PCR ; therefore, she was isolated in a hotel room. On day 5, she started taking maoto, traditional Kamp medicine, because a high fever and nausea continued after her moving to the hotel. After taking maoto, perspiration was noted, and the fever resolved. Treatment with maoto was stopped for one day due to worsening of the nausea. The result of a new PCR was positive on day 7, but showed a decreased viral load. Maoto has been shown to be effective against influenza. The present case suggests that maoto may also be effective for novel coronavirus infection (coronavirus disease 2019 ; COVID-19) with influenza-like symptoms. In addition, since nausea may occur as a side effect of maoto, additional combination with other Kampo drug(s) may be considered.

We report two cases of patients with intractable upper abdominal pain and histories of injury or surgery. The patients' pains were successfully treated with tokishigyakukagoshuyushokyoto (TSG). Case 1 involved a 59-year-old woman with left upper abdominal and thoracodorsal pain lasting 5 years. Kampo drugs such as tokito or prescriptions containing saiko were ineffective. Two years after her first visit, we noticed an injury scar from childhood that passed near the left hikon (pi-gen, ExB4) and induration and tenderness of the left hikon. TSG was administered, and the pain promptly improved. Case 2 involved a 66-year-old woman. She complained of epigastric, right­-upper-­quadrant abdominal and back pain lasting 7 years. Two years before presentation, the pain had worsened, but the cause was unclear. Although keishibukuryogan or Kampo drugs containing saiko were ineffective, her pain improved when TSG plus bushi was administered. A wound from a cholecystectomy was observed on her right abdomen. Induration and tenderness of the right hikon were demonstrated. The combination of past history of injury or surgery of the upper abdomen or back and induration of hikon can be associated with development of indications for TSG.