Category Nuances matching pains:

• common,
• abdominal,
• skeletal,
• physical,
• serious,
• chronic,

Members for simple category pains:

• muscle_pains,
• joint_strain,
• stomach_pains,
• gas_pains,
• tendon_pains,
• period_pains,
• chronic_pains,
• joint_pains,