turiya
From what I've heard:
Most cases of sunken eyes relate to the quality of an individual’s nutrition and living choices.
When these causes are corrected, sunken eyes can resolve without further treatment. This means that causes can be avoided or treated in good time to prevent the recurrence of sunken eyes.
Related issues include:
- Dehydration
- Vitamin deficiencies, specifically C & K
- Insomnia
- As the body ages, it tends to lose collagen. The first place where collagen loss is most noticeable is the skin under the eyes. The loss of collagen causes the eyes to settle back into the eye sockets, making the eyes appear sunken.
- Weight loss. Most people tend to lose weight in their face first.
- Smoking
- Sinus infections. Inflamed sinuses are another culprit of sunken eyes.
https://www.medicalnewstoday.com/articles/320134#medical-treatment