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Subarachnoid Hemorrhage (SAH) is an extremely dangerous condition where the subsequent prognosis is often determined within just the first few minutes after onset. The symptoms are dramatic, with the "worst headache ever experienced" appearing in nearly 100% of patients.

Subarachnoid Hemorrhage (SAH) is often treated as a uniform condition, but its prognosis and treatment strategy differ greatly depending on the cause of the bleeding. While ruptured unruptured aneurysms, often detected during brain checkups, account for over 80% of cases, Non-Aneurysmal Subarachnoid Hemorrhage (NA-SA), where no aneurysm is found, generally has a relatively favorable prognosis.SAH is primarily classified by its cause, rather than the location or shape of the bleeding. This classification is the standard used in the guidelines of the Japan Neurosurgical Society.

Subarachnoid Hemorrhage (SAH) is one of the most fatal types of stroke, demanding immediate action as time is critical for patient survival. The annual incidence in Japan is approximately 30,000 cases, with over 80% of cases caused by the sudden rupture of a cerebral aneurysm. The most characteristic signs of this disease are the "worst headache of life, like being hit by a hammer," vomiting, and temporary loss of consciousness.

When using life or medical insurance for Intracerebral Hemorrhage (a type of stroke), the payout can vary significantly based on your contract details, hospitalization days, whether surgery was performed, and whether death or residual disability occurred. Generally, medical insurance primarily covers hospitalization and surgery, while life insuranceapplies through critical illness riders and death benefits. Public health insurance's High-Cost Medical Care Benefits system (capping monthly self-pay at approximately ¥80,000) is used concurrently, with private insurance acting as a supplement. The benefit amounts are estimates; please consult your policy or insurance company for actual figures. The average hospital stay is approx. 77–78 days (MHLW data), and the total medical cost (30% co-pay) is approx. ¥700,000 for mild to moderate cases.

The treatment for Intracerebral Hemorrhage (ICH) is often long-term, spanning from acute life-saving procedures to recovery rehabilitation, with total medical expenses commonly reaching several million yen. Anxiety over this financial burden is a major concern for patients and their families.However, by properly utilizing Japan's public health insurance system and the High-Cost Medical Care Benefits (Kōgaku Ryōyōhi) system, the actual out-of-pocket payment at the hospital window can be significantly reduced.

Intracerebral Hemorrhage (ICH) is a disease where patients often require extended hospital stays for rehabilitation, even after surviving the life-threatening acute phase. However, as of 2025, advances in medical systems and treatment technology have shown a trend toward shorter hospital stays.

Rehabilitation following Intracerebral Hemorrhage (ICH) is not just about increasing the volume of training. Conducting appropriate rehabilitation tailored to the time elapsed since onset and the brain's recovery mechanisms is key to improving residual deficits and achieving social reintegration. Particularly, the period from 1 to 6 months after onset is the "Golden Period" when the recovery of paralyzed limbs and speech is most pronounced.

After surviving the acute phase of Intracerebral Hemorrhage (ICH), patients and their families face a long battle with its sequelae (after-effects). The type and severity of these residual deficits vary by the location of the bleeding, and Thalamic Pain, which often follows thalamic hemorrhage, is known to be the most agonizing symptom for survivors.

Intracerebral Hemorrhage (ICH) is a disease where the risk can be "almost certainly reduced" by adopting appropriate measures. Since the chance of severe disability is high once the disease occurs, prevention is paramount.

Intracerebral Hemorrhage (ICH) is an extremely serious condition, accounting for approximately 20–25% of all strokes. It is not only life-threatening but also carries a high risk of leaving severe residual disabilities. This disease is predominantly caused by hypertension, and the symptoms that appear vary significantly depending on the site of the bleeding (e.g., putamen, thalamus, cerebellum).