Medical disclaimer

1. What Koharu does and does not do

Koharu does

• Log and organize your health, symptoms and medications from what you say or enter
• Show your log next to sleep, heart rate, steps and air pressure
• Create a summary (PDF) to show at appointments
• Listen to you and share general information

Koharu does not

• Suggest possible diagnoses or judge whether you may have a disease
• Tell you to change or stop a medication
• Decide for you whether you need to see a doctor
• Promise that you will feel better

2. About Koharu's replies

Koharu is an AI. Its replies can be wrong or not fit your situation. Check with your doctor before making any medical decision.

Logs extracted from conversations can also be wrong. Check them on the log card and edit them if needed.

3. About patterns

Patterns, such as "in your records, more headaches were logged on days when the air pressure dropped", are made by counting and comparing your records. They do not show causes and may change as you add more records.

4. Medication logs and reminders

Medication reminders notify you at the times you set. They are not instructions on how to take your medication. The medication names suggested in the app are there to make logging easier and are not recommendations. For medications added from an Okusuri Techo QR code, the dose times are first values that the app sets from the directions (such as "after breakfast"); they are not instructions on how to take your medication. Always talk to your doctor or pharmacist before changing how you take a medication.

5. About the appointment report

The appointment report summarizes your records. The numbers are calculated from your records on your iPhone. The summary text is written by AI and may contain mistakes, so check it before handing it to your doctor. Your doctor makes the medical judgments.

6. About air pressure data

Air pressure comes from Apple Weather (WeatherKit) and may differ from the actual pressure where you are. See Apple Weather data sources and legal information.

7. When to call emergency services right away

For example, call an ambulance without hesitation if you have:

• A sudden, severe headache, or a sudden high fever
• One side of the face drooping or numb, a lopsided smile, or slurred speech
• Sudden numbness, or sudden weakness in one arm or leg
• Sudden shortness of breath, difficulty breathing, or a squeezing or pressing pain in the center of the chest lasting 2 to 3 minutes
• Sudden, severe abdominal pain, or vomiting blood
• Confusion or loss of consciousness, or a seizure that does not stop

Source: Ministry of Health, Labour and Welfare of Japan, "Call 119 without hesitation in these cases" (based on the Fire and Disaster Management Agency's ambulance leaflet; in Japanese)

8. Crisis lines

If you keep feeling low, or have thoughts of hurting yourself, please reach out instead of carrying it alone.

United States

• Emergency services91124 hours
• 988 Suicide & Crisis Lifeline988Call or text, 24 hours (988lifeline.org)

Japan

• Emergency services (life-threatening)11924 hours
• Emergency advice center (not sure whether to call an ambulance)#7119Only in areas that offer it. Elsewhere, call 119 or use the national app "Q-suke"
• #Inochi SOS0120-061-33824 hours, free
• Yorisoi Hotline0120-279-33824 hours, free (from IP phones starting with 050: 050-3655-0279)
• Inochi no Denwa (Lifeline)0570-783-55610:00 to 22:00 (call charges apply)

Numbers and hours for Japan were checked on October 16, 2026 against the Ministry of Health, Labour and Welfare's list (in Japanese). In other countries, call your local emergency number.

9. What research has found

What research has found about keeping health records, air pressure and medical appointments. None of it shows results of using Koharu.

• Japanese Society of Neurology, Japanese Headache Society and Japanese Society of Neurological Therapeutics, Clinical Practice Guideline for Headache Disorders 2021: keeping a headache diary is recommended.
• Kimoto K, et al. Influence of barometric pressure in patients with migraine headache. Intern Med. 2011;50(18):1923-8. (PubMed): In 28 people with migraine near Utsunomiya, Japan, who kept a headache diary for a year, migraines were more frequent when air pressure fell by more than 5 hPa from the headache day to the next day.
• Kessels RPC. Patients' memory for medical information. J R Soc Med. 2003;96(5):219-22. (PMC): 40 to 80% of medical information provided by healthcare practitioners is forgotten immediately.