The 4 Stages of Wound Healing and Your Role in the Process

Content medically reviewed by James Ryan, MD

Every year, more than 15 million Americans undergo surgery, according to the American College of Surgeons. Many surgeries require small or large incisions that heal over time. Understanding the stages of wound healing helps you know what to expect and how to help your body heal.

Surgery is used in orthopedics and sports medicine, cancer care, and many other areas of medicine. However, surgery is only one step of the healing process, and no healing is complete if the surgical wound remains open.

In the days and weeks after surgery, your wound goes through four stages: hemostasis, inflammation, proliferation, and remodeling.

Stage 1: Hemostasis

Even minimally invasive approaches require tiny incisions. During the first stage of wound healing, your body works to prevent further blood loss. It does this through these steps –

• Constriction. Soon after the surgeon makes an incision, small muscles inside broken blood vessels constrict. When this happens, the vessels partially or totally close, reducing or stopping blood loss.
• Initial clotting. Blood platelets stick together to temporarily plug the site of bleeding. These platelets then change and cause reactions that create a primary platelet plug in the wounded area.
• Finalized plugging. Blood-clotting proteins form a stronger. In time, the size of the clot reduces and blood flow restarts in the previously constricted blood vessels.

This stage begins within half an hour of the initial incision and can take up to a few days to complete.

Stage 2: Inflammation

The second stage of wound healing normally lasts several days. Known as the inflammatory stage, it brings your immune system into the process.

At this point, your white blood cells and platelets go into overdrive. Your immune system goes on high alert, working to protect the wound from infection.

As your immune system kicks into gear, you’ll experience the telltale signs of inflammation: mild swelling, redness, and warmth at the wound site. This indicates your body is –

• Allowing healing cells to enter and repair the wound
• Getting rid of damaged or dead tissue and bacteria that would negatively affect wound healing
• Preparing the base of the wound for new tissue growth

Stage 3: Proliferation

Though considered the third stage of wound healing, proliferation occurs throughout the process. This part of healing produces new, healthy tissue for the wound site. The goal is to produce enough tissue to cover the wound, so the affected area regains its natural look and function.

As this process proceeds, these milestones occur –

• Barrier reforms. Skin cells spread across the wound surface to form a protective barrier over the wound.
• Fibroblasts multiply. Fibroblasts are cells that aid in collagen production. Collagen is a main protein found in your skin and other connective tissues that helps produce new connective tissue called granulation tissue.
• New blood vessels form. These new blood vessels increase blood flow to the wound.
• The wound shrinks. This is when progress becomes visibly obvious. The wound’s edges pull toward one another, reducing the wound size until it eventually closes altogether.

Stage 4: Remodeling

Also known as wound maturation, remodeling is the last stage of wound healing. It starts in the early weeks of healing and can take a year to complete. Remodeling builds on previous steps to provide long-term healing of the wounded area.

In this part of the process, tissue and collagen increase in strength to help maintain a healthy wound covering. Remodeling also continues to shrink the wound size as the edges contract. Eventually, the wound closes totally, covering the wound site.

Your Role in Wound Care

Your body handles the heavy lifting in all the stages of wound healing. By taking good care of yourself and your wound, you help your body do its work as quickly as possible.

A few things you can do to speed up the healing process include –

• Following up with your provider. Your surgeon will want you to schedule a visit for the days after surgery. This allows your provider to check on the healing progress and make needed adjustments.
• Keeping the wound clean. Ask your surgeon how and when to clean your wound and change dressings. Follow these directions carefully.
• Leaving your wound alone. Picking or scratching at the surgical site can cause scarring and slows the healing process.
• Making healthy dietary choices. The American Academy of Nutrition and Dietetics states that a balanced, healthy diet with plenty of protein, water, and fruits and vegetables may help heal your wound.
• Reporting anything odd. It’s normal to have a little inflammation during healing. If your wound produces pus or pain, a bad smell, fever, or chills, your incision site may have an infection.

On rare occasions, an untreated infection can lead to chronic, non-healing wounds and other problems. So, if you notice a potential infection, contact your surgical team. It’s better to be safe than sorry.