Pecho vs. tórax
While both pecho and tórax can be translated as chest in English, they are not interchangeable. The main difference lies in the context of their use: pecho is the common, everyday term, while tórax is a more formal, technical, and anatomical term.
Pecho
A1This is the most common and versatile word for chest. It refers to the front upper part of the torso and is used in everyday conversation, to describe physical appearance, to express emotions, and in many idiomatic expressions. It can also refer to the breast or bosom.
Siento un dolor agudo en el pecho.
(I feel a sharp pain in my chest.)
El levantador de pesas tiene un pecho muy fuerte.
(The weightlifter has a very strong chest.)
Abrió la carta con el corazón latiéndole en el pecho.
(She opened the letter with her heart pounding in her chest.)
La madre acunó al bebé contra su pecho.
(The mother cradled the baby against her chest.)
La medalla le colgaba sobre el pecho.
(The medal was hanging on his chest.)
Es un hombre de pelo en pecho.
(He is a very manly/brave man (literally, a man with hair on his chest).)
Tórax
B2This is the scientific and medical term for the chest or thorax. It refers to the entire chest cavity, including the rib cage, which encloses and protects vital organs like the heart and lungs. Its use is almost exclusively limited to formal, medical, or anatomical contexts.
El médico solicitó una radiografía de tórax para ver los pulmones.
(The doctor requested a chest x-ray to see the lungs.)
En la clase de anatomía estudiamos la estructura del tórax.
(In anatomy class, we studied the structure of the thorax.)
El paciente sufrió una lesión grave en el tórax durante el accidente.
(The patient suffered a serious injury to the thorax during the accident.)
El corazón y los pulmones están ubicados dentro de la cavidad del tórax.
(The heart and lungs are located inside the thoracic cavity.)
Los insectos se dividen en cabeza, tórax y abdomen.
(Insects are divided into a head, thorax, and abdomen.)
La cirugía se realizará mediante una incisión en el tórax.
(The surgery will be performed through an incision in the thorax.)
Summary
In essence, use pecho for all general and everyday situations, such as describing pain, appearance, or feelings. Use tórax when you are in a medical, scientific, or highly formal setting where anatomical precision is required. Think of pecho as the common word and tórax as the technical term.