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[2026] What is Riko Fujisawa's Graves' Disease? Summary of Symptoms and Activity Restrictions
≒JOY's Riko Fujisawa announced on September 20, 2026, that she has Graves' disease, and that there will be some restrictions on her future activities and appearances. This article summarizes the key points of the announcement, what Graves' disease is, its main symptoms, and Riko Fujisawa's future activities and profile.
[2026] What is Riko Fujisawa's Graves' Disease? Summary of Symptoms and Activity Restrictions
table of contents
- Riko Fujisawa announces she has Graves' disease (Key points)
- What is Graves' disease?
- Main symptoms of Graves' disease
- What will Riko Fujisawa's future activities and appearances be?
- Riko Fujisawa's Profile
- Frequently Asked Questions (FAQ)
Q. What did Riko Fujisawa announce?
A. On September 20, 2026, Riko Fujisawa of ≒JOY announced on the group's official website and her own social media that she had been diagnosed with Graves' disease.
Q. What are your plans for future activities?
A. Prioritizing the individual's recovery, it has been announced that some restrictions will be placed on future activities and appearances. Further details will be announced as they become available.
Q. What is Graves' disease?
A. This is an autoimmune disease that causes hyperthyroidism, a condition in which the thyroid gland produces too much thyroid hormone, and symptoms such as palpitations, sweating, hand tremors, and weight loss may appear.
1. Riko Fujisawa announces she has Graves' disease (Key points)
On September 20, 2026, the idol group "≒JOY (Nearly Equal Joy)," produced by Rino Sashihara, updated its official website to announce that member Riko Fujisawa (22) had been diagnosed with Graves' disease.
On her official website, she reported that she had been experiencing persistent health problems and, after a medical examination, was diagnosed with Graves' disease. She also stated that this would mean some restrictions on her future activities and appearances. Further updates regarding her future activities and appearances will be announced as they become available.
🔗 Fujisawa Riko Official Instagram (@fujisawa_riko)
Riko Fujisawa herself also reported on her social media, "I'm sorry to surprise you with this sudden announcement," and "I went to the hospital because I had been feeling unwell for the past few days and was diagnosed with Graves' disease." She also wrote about her hopes for recovery, saying, "I want to face this illness head-on, get well, and sing and dance with all my might in front of everyone as soon as possible."
On the day of the announcement, Riko Fujisawa was performing at "IDOL RUNWAY COLLECTION 2026" held at Yokohama Arena.
2. What is Graves' disease?
Graves' disease is a common disease that causes hyperthyroidism, a condition in which the thyroid gland produces too much thyroid hormone. Thyroid hormones are essential for promoting metabolism throughout the body, but when produced in excess, they put a strain on organs throughout the body, including the heart, leading to a variety of symptoms.
Graves' disease is an autoimmune disease. It is thought to develop when the immune system, which normally protects the body from bacteria and viruses, inadvertently produces antibodies (anti-TSH receptor antibodies) that stimulate the thyroid gland, leading to excessive secretion of thyroid hormones. While the exact cause of antibody production is unclear, factors such as genetic predisposition, severe stress, smoking, overwork, pregnancy, and childbirth are believed to be contributing factors.
According to the Japan Endocrine Society and other sources, Graves' disease is more common in women, with a male-to-female ratio of approximately 1:5 to 6 women. It is most frequently seen in people in their 20s to 50s, and especially in those in their 20s to 40s. Riko Fujisawa, who is in her 20s, falls into this age group.
There are generally three main treatment methods.
| treatment | Content |
| Antithyroid drugs (drug therapy) |
This is an oral medication that suppresses the excessive production of thyroid hormones, and it is often the first choice of treatment.
|
| Isotope therapy | This treatment uses radioactive iodine to suppress thyroid function. |
| Surgery (thyroidectomy) | This method involves removing part or all of the thyroid gland. |
The choice of treatment is determined in consultation with a doctor, taking into account the severity of symptoms, age, and lifestyle. With appropriate treatment, it is possible to control symptoms and maintain a normal daily life.
3. Main symptoms of Graves' disease
In Graves' disease, an excess of thyroid hormones leads to overactive metabolism, resulting in a variety of symptoms throughout the body. The way these symptoms manifest varies from person to person. The main symptoms are as follows:
| Part/classification | Main symptoms |
| Heart and Circulation | Palpitations, rapid pulse (tachycardia), shortness of breath |
| whole body | Excessive sweating, feeling hot easily, fatigue, lethargy |
| Weight and appetite | My appetite has increased, but my weight is decreasing. |
| Hands and nerves | Hand tremors, irritability, restlessness |
| neck | Swelling of the thyroid gland (swelling of the neck) |
| eye | Swollen eyelids, protruding eyeballs |
Thyroid swelling, rapid heartbeat, and exophthalmos are known as characteristic symptoms of Graves' disease. These symptoms are easily mistaken for fatigue or autonomic nervous system dysfunction, and in some cases, like Riko Fujisawa's, a diagnosis is made only after seeking medical attention due to persistent poor health.
4. What will Riko Fujisawa's future activities and appearances be?
According to an official announcement from ≒JOY, Riko Fujisawa's future activities and appearances will be subject to some restrictions. This decision was made with her recovery as the top priority.
The group has expressed its deep regret to those involved and their fans, and is asking for their understanding. They stated that details regarding future activities and appearances will be announced as they become available. At this time, there have been no announcements regarding members leaving or graduating.
Riko Fujisawa herself commented, "I may not be able to deliver performances that meet everyone's expectations in my future activities, but I want to do my best at the time," indicating her intention to continue her activities while balancing them with treatment.
5. Riko Fujisawa's Profile
Riko Fujisawa is known as one of the most skilled dancers in ≒JOY. Here is her basic profile:
| item | Content |
| name | Riko Fujisawa |
| Nickname | Riko |
| date of birth | January 16, 2004 |
| Birthplace | Saitama Prefecture |
| Affiliation | ≒JOY (Produced by Rino Sashihara) |
| Features | Top-notch dance skills and high performance ability within the group. |
≒JOY is a group that made its major debut in 2024 and has steadily expanded its activities, including holding a concert at the Nippon Budokan in 2026 to commemorate the group's fourth anniversary. Riko Fujisawa has made her presence felt within the group through her dance and performance skills.
6. Frequently Asked Questions (FAQ)
Q1. When did Riko Fujisawa announce that she had Graves' disease?
A. It was announced on September 20, 2026, on the ≒JOY official website and on the individual's social media accounts.
Q2. Is Riko Fujisawa leaving or graduating from the group?
A. There have been no announcements of departures or graduations at this time. The announcement only states that there will be some restrictions on activities and appearances.
Q3. Is Graves' disease curable?
A. Treatment options include medication, radioisotope therapy, and surgery. It is believed that with appropriate treatment, patients can control their symptoms and live a normal life. Treatment plans are determined in consultation with a doctor.
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