kyphosis
Medical term for an excessive outward curvature of the spine, causing a hunched back.
In the elderly, kyphosis can cause worsening of posture.
Scoliosis, a sideways curvature of the spine, whereas 脊柱後弯症 is a forward curvature.
From 脊柱 (spine) + 後弯 (backward bending) + 症 (condition).