What's behind the grounding.

The most common cause is arthritis — specifically osteoarthritis of the hips, stifle (knee), hock (ankle), or spine. Studies show that up to 90% of cats over age 12 have radiographic evidence of arthritis, making it far more common than most cat parents realize. Because cats compensate for joint pain by modifying behavior rather than limping or vocalizing, the loss of jumping is frequently the first — and sometimes only — visible indicator.

Reading the signs she'll never say.

Since your cat won't tell you she hurts, look for the constellation of behavioral changes that accompany joint pain in cats. A cat that stopped jumping due to arthritis will typically show at least two or three additional signs: reduced grooming (especially along the back and hind legs, leaving a scruffy or matted coat), stiffness after sleeping (slow, careful movement when first getting up), reluctance to use stairs, changes in litter box habits (missing the box because squatting hurts, or avoiding a box with high sides), decreased playfulness, and irritability when touched in certain areas.

If the jumping decline has been gradual rather than sudden and comes with even one or two of these secondary signs, arthritis is the most likely explanation. A veterinary examination — ideally including X-rays — can confirm the diagnosis and identify which joints are most affected.

What you can do at home.

The combination of environmental modifications and therapeutic interventions can dramatically improve your cat's quality of life, even if the underlying arthritis cannot be reversed.

Create alternative access to favorite spots. Pet stairs, small ramps, or strategically placed furniture give your cat a stepped path to the places she loves — an ottoman at bed height, a small cat tree with graduated platforms to the windowsill. Cats are problem-solvers: give them an easier route and they'll use it.

Switch to low-entry litter boxes. High-sided boxes require a step or jump that arthritic cats find painful. Use boxes with one low side (cut down a regular box if needed) or a shallow tray, and place at least one on every floor so she never has to navigate stairs to reach it.

Provide warm, padded resting spots at ground level. Heated cat beds or self-warming mats in her preferred areas give comfortable options without any jumping required — and warmth naturally soothes arthritic joints.

Begin a red light therapy routine. Drug-free, silent, and done during natural rest periods — the full home routine lives in the next section.

Maintain a healthy weight. An overweight cat with arthritis faces a double burden: painful joints carrying extra load. Even a modest reduction — as little as 5–10% of body weight — can meaningfully reduce joint stress and improve willingness to move.

Ask your vet about pain management options. Solensia (frunevetmab), a monthly injection specifically for feline osteoarthritis, treats cat joint pain without daily pills. Joint supplements with omega-3 fatty acids and glucosamine provide gentle supportive care. Your veterinarian can tailor the plan to your cat.

Track the comeback, weekly.

Keep a simple weekly log of behaviors that indicate comfort and mobility: whether she's attempting jumps she had abandoned, whether she's more active during play, whether grooming has improved in previously neglected areas, and whether she seems more social and engaged. Weekly video recordings are even more useful — gradual changes that are hard to notice day-to-day become obvious when you compare week 1 to week 4.