Sunken eyes happen when the area between your lower eyelid and cheekbone loses volume, creating a hollow or shadowed appearance. The fixes range from simple lifestyle changes to injectable fillers and surgery, depending on whether the cause is temporary (like dehydration or poor sleep) or structural (like aging or genetics). Understanding what’s driving your specific hollowing is the first step toward choosing the right solution.
Why Eyes Look Sunken
The under-eye area has some of the thinnest skin on your body and very little fat beneath it. That makes it one of the first places to show volume loss. As you age, the fat pads that sit behind and below your eye begin to shrink and slide downward. The ligaments holding everything in place stretch and weaken, and even the bone underneath slowly resorbs over time. The result is a visible depression that runs from the inner corner of your eye outward, sometimes called a tear trough.
Genetics play a major role. If your cheekbone is more prominent, the gap between the bone and the skin in that area can be wider, pulling the ligament tighter and creating a deeper hollow even at a younger age. Some people notice sunken eyes in their 20s for this reason alone.
Beyond aging and anatomy, several other factors accelerate the problem: smoking, chronic sun exposure, hormonal changes (especially drops in estrogen or thyroid imbalances), corticosteroid medications, autoimmune conditions, and significant nutritional deficiencies. Iron deficiency anemia, for instance, makes the skin paler overall, which exaggerates the dark, hollow look under the eyes.
Lifestyle Fixes for Mild Hollowing
If your sunken eyes come and go, the cause is likely something you can address without any procedure. Dehydration is one of the most common culprits. When your body is low on fluids, the thin skin under your eyes loses what little plumpness it has. Simply drinking enough water throughout the day can produce a noticeable improvement within days. Illness that causes vomiting, diarrhea, or heavy sweating can trigger sudden hollowing that resolves once you rehydrate.
Sleep deprivation is the other big one. Poor sleep affects circulation and fluid balance in the face, making the under-eye area look darker and more recessed. Consistently getting seven to nine hours helps, though the effect is gradual rather than overnight. If your eyes still look hollow despite good hydration and sleep habits, you’re likely dealing with a structural issue that lifestyle changes alone won’t fully resolve.
Nutrition matters too. A diet lacking in iron, vitamin C, and vitamin K can worsen the dark, hollow appearance. Iron-rich foods (red meat, lentils, spinach) help if anemia is contributing to your pallor. Significant undereating or crash dieting can accelerate facial volume loss across the board, and the under-eye area shows it first.
Hyaluronic Acid Fillers
For most people with moderate sunken eyes, injectable hyaluronic acid filler is the most popular and accessible treatment. A provider uses a fine needle or cannula to place a small amount of gel-like filler into the tear trough, restoring the volume that fat loss or genetics took away. The procedure takes about 15 to 30 minutes, and there’s minimal downtime. You can typically return to normal activities the same day, though mild swelling and bruising are common for a few days. Results settle into a natural appearance within about a week.
Results last longer than most people expect. While the standard estimate is 6 to 12 months, a retrospective study published in the Journal of Clinical and Aesthetic Dermatology found that tear trough fillers showed significant results at 18 months, with some patients still seeing improvement at 24 months. The under-eye area doesn’t move as much as, say, the lips, so filler tends to break down more slowly here.
That said, the under-eye area is one of the trickiest spots to inject. The skin is so thin that filler placed too superficially can create a bluish discoloration called the Tyndall effect, where light scatters off the tiny filler particles beneath the skin. This can appear immediately or days after treatment and may persist for months if not corrected. Using too much filler or the wrong type increases the risk. Choosing a provider who specializes in tear trough injections, not just any injector offering the service, significantly reduces your chances of complications. Hyaluronic acid fillers have one important safety net: they can be dissolved with an enzyme injection if the results are unsatisfactory or a complication arises.
Fat Transfer for Longer-Lasting Results
If you want something more permanent than filler, autologous fat transfer uses your own fat to fill the hollow. A provider harvests fat from another area of your body (commonly the abdomen or thighs) through a small liposuction procedure, processes it, and injects it under your eyes. According to Cleveland Clinic, results from an under-eye fat transfer can potentially last a lifetime, though outcomes vary from person to person.
The trade-off is a longer recovery. Because fat transfer involves liposuction at the donor site plus injection at the under-eye area, you’re healing in two places. Swelling and bruising are more significant than with filler, and it takes several weeks to see final results. Your body absorbs roughly half the transferred fat, so providers intentionally inject more than seems necessary at first. The upside is that transferred fat looks and feels more natural than synthetic filler, and there’s no risk of an allergic reaction since it’s your own tissue.
Surgery: Fat Repositioning
For people with both under-eye bags and hollowing (a common combination as you age), lower eyelid surgery can address both problems at once. The modern approach is fat repositioning rather than traditional fat removal. Instead of cutting away the puffy fat that bulges forward to create bags, the surgeon takes those same fat pads and moves them downward over the orbital rim to fill the tear trough below.
This is typically done through an incision on the inside of the lower eyelid, leaving no visible scar. The repositioned fat pads are secured in their new position with sutures that are removed about a week later. The result smooths the transition between the lower eyelid and the cheek, eliminating both the bag and the hollow in one procedure. Recovery involves swelling and bruising for one to two weeks, with final results becoming apparent over the following months.
This approach is a significant step up in commitment compared to fillers. It requires anesthesia, a surgical setting, and more downtime. But for the right candidate, particularly someone with visible fat herniation (bags) combined with a deep tear trough, it provides a structural correction that fillers can’t replicate.
Choosing the Right Approach
Your best option depends on your age, the severity of the hollowing, and what’s causing it. Mild, fluctuating hollowing in someone under 30 often responds well to hydration, sleep, and nutritional improvements. Moderate hollowing from early volume loss is a good match for hyaluronic acid filler, which lets you test results without a permanent commitment. Deeper structural hollowing, especially combined with under-eye bags, may warrant fat transfer or surgical repositioning for a lasting fix.
One thing to keep in mind: the under-eye area is unforgiving. The skin is thin, the anatomy is complex, and mistakes are immediately visible. Whatever approach you choose, the skill of the provider matters more here than almost anywhere else on the face. Look for someone who performs tear trough treatments regularly, not occasionally, and ask to see before-and-after photos of their own patients.