Signs of internal bleeding
- Blood volume drops but no limb shows a teardrop icon.
- The total bleeding rate under the blood volume meter is higher than the limb icons explain.
- The internal bleeding moodle, which appears at about 0.043 L/min and changes with severity.
- Vomiting blood. Internal bleeding builds up a separate bloody-vomit timer.
- Pain in the thorax and falling oxygen, from hemothorax.
Internal bleeding is slower than a bad cut: it is capped at about 0.21 L/min, and extra severity makes it last longer instead of faster. The danger is that it does not stop on its own and fills your chest.
How to stop internal bleeding
| Treatment | Notes |
|---|---|
| L.R.D. | Full tool, reusable with L.R.D. serum. Craft at INT 15. Also removes 12 venom. |
| Makeshift L.R.D. | Craft at INT 10, uses L.R.D. serum (INT 11). The early-game answer. |
| Procoagulant | Thickens blood and stops the bleed. Crafted from bunchunk (Fungal pools fungus) or found. Also clears strokes fast. |
| Helluce | A plant from layer 4 onward. Eat it. |
| Last stand | Cuts internal bleeding by 95%, once per run. |
Avoid lowering blood viscosity while bleeding internally. Thin blood bleeds faster everywhere. Community wiki
Hemothorax: blood around the lungs
While internal bleeding is at or above the moodle threshold, blood builds up around the lungs at about 2.6 per minute (more if the bleed is worse). The health panel shows it as a yellow outline growing around the lungs.
| Hemothorax | Effect |
|---|---|
| Any | -0.3% max oxygen and -0.125 breaths/min per point, thorax pain |
| 40 | Moodle appears: about -5 breathing rate and -12% max oxygen |
| 70 | Moodle turns critical: about -8.75 breathing rate and -21% max oxygen |
| 100 | Outline complete |
| 200 | Breathing stops |
Fix: stop the bleed, then use a chest drain on the chest. Each use removes 35 hemothorax and causes a little bleeding. The drain recharges by itself, so keep it. It is crafted at INT 12 and found in medical crates, drop capsules and life pod chests.
Venom and toxicosis
Some bites carry hemotoxin. Venom thickens the blood, lowers oxygen, slowly destroys blood and slows clotting. Above 20 venom, bleeding will not heal naturally, so bandage instead.
| Source | Venom |
|---|---|
| Shade crawler bite | 20 |
| Overgrown tick bite | 14 |
| Cave tick bite | about 1 |
| Eating a venom gland | 30 |
Moodles: mild toxicosis above 2, toxicosis above 25, severe above 55, toxic crisis above 80. Venom wears off at about 0.1 per second. Antivenom removes 80 per 100 ml and was buffed in 1.0. An L.R.D. removes 12. Digestion crystal shards also reduce toxicosis since 1.0. Official Most of the time the practical answer is to wait it out while keeping blood volume up.
Questions
How do you get blood out of your lungs in Casualties: Unknown?
That is hemothorax. Only the chest drain removes it directly, 35 points per use, and it recharges after each use. Stop the internal bleeding first or it keeps refilling. A last stand also halves hemothorax.
What causes internal bleeding?
Muscle damage to the head, thorax or abdomen from gunshots, explosions and falls, an abdomen below about 4% muscle health, radiation sickness above 9 Gy, and hard stimulants.
Can I make an L.R.D.?
Yes. A makeshift L.R.D. needs INT 10 and L.R.D. serum needs INT 11. The full L.R.D. needs INT 15. Spare serum from duplicate L.R.D.s can be stored in an IV bag.
Where is helluce?
The community guide lists helluce from layer 4 (Wasteland) onward. Eating it treats internal bleeding. Since 1.0 eating it also drops whatever you hold in your mouth.
Sources
- Community wiki Blood (volume, pressure, internal bleeding, viscosity) Scav Prototype / C:U wiki, checked 2026-09-21
- Community wiki Injuries (limb and body statuses) Scav Prototype / C:U wiki, checked 2026-10-03
- Community wiki Guide: Getting started Scav Prototype / C:U wiki, checked 2026-07-09
- Official Release 1.0 patch notes Steam news, checked 2026-11-09