Silent Killers: Terrifying Diseases You Could Have Without Knowing It

2. Osteoporosis

Osteoporosis isn't always painful, until you fracture a bone.

Bone loss as a result of aging can lead to osteoporosis. | iStock.com/KatarzynaBialasiewicz

According to the National Osteoporosis Foundation, osteoporosis occurs due to bone density loss, but this doesn’t come with any signs or symptoms. The condition is responsible for over 2 million broken bones every year. Though some people lose height and posture as a result of osteoporosis, it sometimes takes years — or a bone fracture — to notice anything’s amiss. Older adults especially should make sure they’re getting enough vitamin D and calcium to prevent bone damage.

Next: Feeling thirsty? That could mean a lot of things.

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